As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - DURING FLIGHT 3919, THE CRWE REPORTED THE LAVATORY AND BAGGAGE SMOKE WARNING ILLUMINATED AFTER TAKEOFF. THE CREW DISCHARGED THE BAGGAGE FIRE BOTTLES AND RETURNED TO IAH WHERE THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED A DEFECTIVE CARGO SMOKE DETECTOR, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)