diff --git a/backend/app/api/v1/routes_jobs.py b/backend/app/api/v1/routes_jobs.py
index c2236ce..9306bbc 100644
--- a/backend/app/api/v1/routes_jobs.py
+++ b/backend/app/api/v1/routes_jobs.py
@@ -21,6 +21,7 @@ from ...core.config import settings
 from ...core.database import get_database
 from ...core.authz import MembershipContext, get_job_or_403, get_membership_context
 from ...core.dependencies import (
+    assert_job_in_user_org,
     get_accessible_project_ids,
     get_current_user,
     require_roles,
@@ -43,6 +44,7 @@ from ...schemas.job import (
     ApproveEnglishRequest,
     ApproveSourceRequest,
     AssetValidationResponse,
+    BlockedOnSourceRequest,
     BulkApproveRequest,
     BulkApproveResponse,
     BulkDeleteRequest,
@@ -56,6 +58,7 @@ from ...schemas.job import (
     JobListResponse,
     JobResponse,
     JobUpdateRequest,
+    PromoteToQCRequest,
     RejectJobRequest,
     ReturnToQCRequest,
     UpdateTTSPreferencesRequest,
@@ -75,8 +78,6 @@ from ...services.validation import asset_validation_service
 from ...services.websocket import connection_manager
 from ...services.zip_download import generate_zip_filename, generate_zip_stream
 from ...tasks import celery_app
-from ...tasks.ingest_and_ai import ingest_and_ai_task
-from ...tasks.translate_and_synthesize import translate_and_synthesize_task
 
 logger = get_logger(__name__)
 router = APIRouter(prefix="/jobs", tags=["jobs"])
@@ -1093,6 +1094,120 @@ async def return_to_qc(
     )
 
 
+@router.post("/{job_id}/actions/blocked_on_source", response_model=JobResponse)
+async def blocked_on_source(
+    job_id: str,
+    request: BlockedOnSourceRequest,
+    http_request: Request,
+    current_user: User = Depends(require_roles(
+        UserRole.LINGUIST, UserRole.REVIEWER, UserRole.PRODUCTION, UserRole.ADMIN,
+    )),
+    db: AsyncIOMotorDatabase = Depends(get_database),
+):
+    """Linguist/Reviewer flags that the source video has an issue requiring PM attention (L-18).
+    Transitions job to QC_FEEDBACK and notifies the PM."""
+    job_doc = await db.jobs.find_one({"_id": job_id})
+    if not job_doc:
+        raise HTTPException(status_code=404, detail="Job not found")
+    await assert_job_in_user_org(job_doc, current_user, db)
+
+    now = datetime.utcnow()
+    result = await db.jobs.find_one_and_update(
+        {"_id": job_id, "status": {"$in": [
+            JobStatus.PENDING_QC.value, JobStatus.QC_FEEDBACK.value,
+        ]}},
+        {"$set": {
+            "status": JobStatus.QC_FEEDBACK.value,
+            "review.notes": f"[BLOCKED ON SOURCE] {request.reason}",
+            "blocked_on_source_reason": request.reason,
+            "blocked_on_source_at": now,
+            "blocked_on_source_by": str(current_user.id),
+            "updated_at": now,
+        }},
+        return_document=True,
+    )
+    if not result:
+        raise HTTPException(status_code=400, detail="Job is not in a QC status")
+
+    await log_job_action(
+        AuditAction.JOB_STATUS_CHANGE, job_id, current_user, http_request,
+        details={"new_status": JobStatus.QC_FEEDBACK.value, "reason": request.reason, "action": "blocked_on_source"},
+    )
+    return JobResponse(
+        id=str(result["_id"]),
+        title=result["title"],
+        status=result["status"],
+        source=result["source"],
+        requested_outputs=RequestedOutputs(**result["requested_outputs"]),
+        review=result.get("review", {"notes": "", "history": []}),
+        outputs=result.get("outputs"),
+        created_at=result["created_at"].isoformat(),
+        updated_at=result["updated_at"].isoformat(),
+    )
+
+
+@router.post("/{job_id}/actions/promote_to_qc", response_model=JobResponse)
+async def promote_to_qc(
+    job_id: str,
+    request: PromoteToQCRequest,
+    http_request: Request,
+    current_user: User = Depends(require_roles(UserRole.PRODUCTION, UserRole.ADMIN)),
+    db: AsyncIOMotorDatabase = Depends(get_database),
+):
+    """Production/Admin manually promotes a job to PENDING_QC, bypassing AI processing (PR-10).
+    Used when AI fails on an edge-case and Production wants to proceed manually."""
+    job_doc = await db.jobs.find_one({"_id": job_id})
+    if not job_doc:
+        raise HTTPException(status_code=404, detail="Job not found")
+    await assert_job_in_user_org(job_doc, current_user, db)
+
+    promotable_statuses = [
+        JobStatus.AI_PROCESSING.value,
+        JobStatus.INGESTING.value,
+        JobStatus.PROCESSING_FAILED.value,
+        JobStatus.TTS_FAILED.value,
+        JobStatus.RENDER_FAILED.value,
+    ]
+    now = datetime.utcnow()
+    result = await db.jobs.find_one_and_update(
+        {"_id": job_id, "status": {"$in": promotable_statuses}},
+        {"$set": {
+            "status": JobStatus.PENDING_QC.value,
+            "updated_at": now,
+        },
+        "$push": {
+            "review.history": {
+                "at": now,
+                "status": JobStatus.PENDING_QC.value,
+                "by": str(current_user.id),
+                "notes": request.notes or "Manually promoted to QC",
+            }
+        }},
+        return_document=True,
+    )
+    if not result:
+        raise HTTPException(
+            status_code=400,
+            detail=f"Job cannot be promoted to QC from its current status. Must be one of: {', '.join(promotable_statuses)}",
+        )
+
+    await log_job_action(
+        AuditAction.JOB_STATUS_CHANGE, job_id, current_user, http_request,
+        details={"new_status": JobStatus.PENDING_QC.value, "notes": request.notes, "action": "promote_to_qc"},
+    )
+    return JobResponse(
+        id=str(result["_id"]),
+        title=result["title"],
+        status=result["status"],
+        source=result["source"],
+        requested_outputs=RequestedOutputs(**result["requested_outputs"]),
+        review=result.get("review", {"notes": "", "history": []}),
+        outputs=result.get("outputs"),
+        created_at=result["created_at"].isoformat(),
+        updated_at=result["updated_at"].isoformat(),
+    )
+
+
 @router.get("/{job_id}/downloads", response_model=JobDownloadsResponse)
 async def get_job_downloads(
     job_id: str,
diff --git a/backend/app/core/dependencies.py b/backend/app/core/dependencies.py
index e943e3e..4a5b0f9 100644
--- a/backend/app/core/dependencies.py
+++ b/backend/app/core/dependencies.py
@@ -170,6 +170,67 @@ async def get_accessible_project_ids(
     return []
 
 
+async def get_user_org_ids(user: User, db: AsyncIOMotorDatabase) -> list[str] | None:
+    """Return org IDs the user belongs to, or None meaning unrestricted (ADMIN).
+
+    Priority: memberships → pm_client_ids (PM legacy) → team.member_user_ids (staff legacy)
+    """
+    if user.role == UserRole.ADMIN:
+        return None
+
+    user_id = str(user.id)
+
+    # Primary: Membership collection
+    org_ids: list[str] = []
+    async for m in db.memberships.find({"user_id": user_id}, {"organization_id": 1}):
+        if m.get("organization_id"):
+            org_ids.append(str(m["organization_id"]))
+    if org_ids:
+        return org_ids
+
+    # PM legacy: pm_client_ids
+    if user.role == UserRole.PROJECT_MANAGER:
+        return list(user.pm_client_ids or [])
+
+    # Staff legacy: team.member_user_ids
+    teams = await db.teams.find({"member_user_ids": user_id}, {"client_id": 1}).to_list(None)
+    if teams:
+        return [str(t["client_id"]) for t in teams if t.get("client_id")]
+
+    return []
+
+
+async def assert_job_in_user_org(job: dict, user: User, db: AsyncIOMotorDatabase) -> None:
+    """Raise 404 (not 403) when user cannot access this job — avoids information disclosure."""
+    if user.role == UserRole.ADMIN:
+        return
+
+    org_ids = await get_user_org_ids(user, db)
+    if org_ids is None:
+        return  # unrestricted
+
+    job_org = job.get("organization_id")
+    if job_org:
+        if job_org in org_ids:
+            return
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Job not found")
+
+    # No organization_id — try project fallback
+    project_id = job.get("project_id")
+    if project_id:
+        project = await db.projects.find_one({"_id": project_id}, {"client_id": 1})
+        if project and project.get("client_id") in org_ids:
+            return
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Job not found")
+
+    # Legacy: client_id == creator user_id
+    job_client_id = job.get("client_id")
+    if job_client_id and job_client_id == str(user.id):
+        return
+
+    raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Job not found")
+
+
 def require_pm_for_client(client_id_param: str = "client_id"):
     """Dependency: ensures the current user is an Admin or PM for the given client."""
     async def checker(
diff --git a/backend/app/schemas/job.py b/backend/app/schemas/job.py
index 095b450..55bab4a 100644
--- a/backend/app/schemas/job.py
+++ b/backend/app/schemas/job.py
@@ -149,3 +149,11 @@ class BulkReturnToQCResponse(BaseModel):
 class BulkDownloadRequest(BaseModel):
     """Request to download multiple jobs as a single zip file"""
     job_ids: list[str]
+
+
+class BlockedOnSourceRequest(BaseModel):
+    reason: str  # brief description of what is wrong with the source video
+
+
+class PromoteToQCRequest(BaseModel):
+    notes: str = ""  # optional context for the QC team
diff --git a/backend/app/services/language_qc.py b/backend/app/services/language_qc.py
index 137f16b..b6b8634 100644
--- a/backend/app/services/language_qc.py
+++ b/backend/app/services/language_qc.py
@@ -515,6 +515,7 @@ async def submit_for_review(
         **(current_state_raw if isinstance(current_state_raw, dict) else {}),
         "status": LanguageQCStatus.PENDING_REVIEW.value,
         "submitted_for_review_at": now,
+        "reviewed_cues": 0,  # R-12: reviewer must re-acknowledge cues after each resubmit
         "history": history,
     }