As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR- DURING FLIGHT 3440, THE CREW NOTED THAT A ERRONEOUS LAV SMOKE WARNING ILLUMINATED. THE CREW VERIFIED THAT THERE WAS NO SMOKE OR FIRE. MAINTENANCE PERFORMED A OPERATIONAL CHECK OF THE LAV SMOKE DETECTION SYSTEM, NO DEFECTS NOTED. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.