As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAT - APU FIRE WARNING INDICATION DURING LANDING. MAINTENANCE DETERMINDED FIRE DETECTION SYSTEM WAS PREVIOUSLY DEFERRED AND APU WAS NOT IN USE AT TIME OF FALSE FIRE WARNING. SUBSEQUENTLY MAINTENANCE CLEARED DEFFERAL WITH THE REPLACEMENT OF THE APU FIRE DETECTOR CANNON PLUG. (W)