As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: FORWARD LAVATORY SMOKE ECAM DURING CRUISE AND THE FLIGHT ATTENDANT DID NOT BELIEVE IT WAS CAUSED BY A PASSENGER - MAINTENANCE INSPECTED THE SMOKE DETECTOR AND PERFORMED AN OPERATIONAL CHECK OF THE LAVATORY SMOKE DETECTOR SYSTEM WITH NO FAULTS OR DEFECTS NOTED