As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. CLASS 1 WARNING LAVATORY SMOKE, WENT AWAY AFTER 30 SECONDS. FLIGHT ATTENDANT REPORT RIGHT AFT LAVATORY WARNING CAME ON. NO EVIDENCE OF SMOKE. PERFORMED OPERATIONAL TEST OF LAVATORY SMOKE DETECTION, IAW AMM 26-17-00. OKAY FOR SERVICE.