As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: RIGHT AFT LAVATORY SMOKE DETECTOR ILLUMINATED DURING FLIGHT AND WENT OUT. AMBER LIGHT ON SMOKE DETECTOR IN TRASH CAN REMAINED ON. FLIGHT ATTENDANT SUSPECT PASSENGERS VAPING. NO SIGNS OF SMOKE OR FIRE. PERFORMED LAVATORY SMOKE DETECTION TEST ON RIGHT AFT LAVATORY PER AMM 26-14-00.