As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: FLIGHT CREW REPORTED THAT WHILE IN CRUISE, A LAVATORY SMOKE ECAM MESSAGE DISPLAYED. FLIGHT ATTENDANT INSPECTED THE FIRST CLASS LAVATORY AND FOUND NO REMAINS OF EVIDENCE NOR ANY FORMS OF TAMPERING. MAINTENANCE ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK OF THE LAVATORY SMOKE DETECTION SYSTEM WITH NO FAULTS OS OR ISSUES NOTED PER AMM 26-17-00.