As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: LAVATORY SMOKE DETECTOR AURAL ALERT/LAVATORY SMOKE ALERTED WITH UNCONFIRMED SMOKE. RIGHT AFT LAVATORY PASSENGER WAS IN LAVATORY. ACCOMPLISHED RIGHT LAVATORY AFT SMOKE DETECTOR SELF TEST OPERATIONS CHECK GOOD POSSIBLY PASSENGER USED VAPE PEN OK FOR SERVICE PER AMM 26-14-00.