What was found
DEN - FLIGHT 4331 - ON POWER UP OF AIRCRAFT, FIRE DETECTOR IN LAVATORY ALARM IS ON. MAINTENANCE REPLACED THE LAVATORY SMOKE DETECTOR. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DEN - FLIGHT 4331 - ON POWER UP OF AIRCRAFT, FIRE DETECTOR IN LAVATORY ALARM IS ON. MAINTENANCE REPLACED THE LAVATORY SMOKE DETECTOR. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.