As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS LAV SMOKE DETECTOR WENT OFF (POSSIBLE PASSENGERS VAPING) MTX REQUEST FUNCTIONAL TEST OF FWD & AFT LAV SMOKE DETECTOR PER AMM TASK 26-14-01-720-801-A. REMOVED FROM SERVICE. PERFORMED OPS TEST OF FWD AND AFT LAV SMOKE DETECTORS IAW AMM 26-14-01-720-801-A. OPS TEST GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.