As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE WARNING CAME ON DURING LANDING ROLL OUT WITH INTERMITTENT FAULT LIGHT. DISCHARGED FIRE BOTTLE, NO EVIDENCE OF FIRE. *S/D* INVESTIGATION REVEALED A CHAFED FIRE DETECTION WIRE. CORRECTIVE ACTION WAS TAKEN TO INSULATE CHAFFED WIRE. THIS IS CONSIDERED AN ISOLATED EVENT.