As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFO TO MX: FA FOUND PASSENGER SMOKING IN LAV F (4L DOOR) BUT SMOKE DETECTOR DID NOT ACTIVATE, DESPITE HEAVY SMOKE. GROUNDED - YES. INFO NOTED BY MX: PERFORMED 4L LAV OPS CHECK OF LAV SMOKE DETECTION SYSTEM PER AMM 26-17-00-710-802-A. OPS CHECK GOOD. INSPECTED 4L LAV SMOKE DETECTOR. CHECKS GOOD. OK FOR SVC.