As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 4183, THE CREW REPORTED THAT THE LAV SMOKE DETECTOR WENT OFF TWICE WITH NO SIGNS OF FIRE OR SMOKE. THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT WHERE MAINTENANCE REMOVED AND REPLACED THE LAV SMOKE DETECTOR PANEL, AND LAV SMOKE DETECTOR, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.