As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT NOT GROUNDED: PILOT REPORTS LAVATORY SMOKE WARNING IN FLIGHT BOTH ECAM AND CABIN. WARNING WENT OUT APPROX 30 SECONDS AFTER INITIAL INDICATIONS. NO SMOKE CONFIRMED IN FIRST CLASS LAV, WHICH WAS INDICATED IN CABIN. MAINTENANCE ACCOMPLISHED CIDS TEST IAW AMM 23-73-00. NO FAULTS DETECTED. GOOD FOR SERVICE.