As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: AFT LAVATORY SMOKE WARNING LIGHT CAME ON IN FLIGHT FOR APPROXIMATELY 2 MINUTES. NO SIGNS OF SMOKE OR VAPE. INSPECTED LAVATORY SMOKE DETECTION ON AFT RIGHT SIDE E AND NIL ABNORMAL NOTED. PERFORMED LAVATORY SMOKE DETECTION - SMOKE TEST PER AMM TASK 26-14-00-730-801.