As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED A LAVATORY SMOKE MESSAGE ON THE EICAS. MAINTENANCE CLEANED THE CONNECTOR PLUG ON THE SMOKE DETECTOR PANEL, OPS TESTED WITH NO DEFECTS AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. THE MESSAGE REPEATED ON NEXT FLIGHT. WHERE MAINTENANCE INSPECTED THE AIRCRAFT. MAINTENANCE REMOVED AND REPLACED THE LAVATORY SMOKE DETECTOR. OPS TESTED WITH NO DEFECTS NOTED, THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.