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 WARNING ECAM DISPLAYED, FORWARD L1 LAVATORY WHILE PASSENGER WAS IN LAVATORY. NO EVIDENCE OF SMOKE WHEN DOOR OPENED AND PASSENGER QUESTIONED. MAINTENANCE ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK OF SMOKE DETECTION SYSTEM PER AMM 26-17-00.