As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING STARTED APU. TAXIED TO GATE, DURING ENGINE SHUTDOWN HAD APU FIRE LIGHT. ACCOMPLISHED QRH PROCEDURE. MAINTENANCE INSPECTED, FIRE BOTTLE FOUND DISCHARGED. REMOVED BATHTUB AND INSPECTED APU FOR DAMAGE. FIRE WAS LIMITED TO TAILPIPE AREA. REAR FIRE LOOP WIRING DAMAGED IN AREA OF TAILPIPE. NO OTHER DAMAGE NOTED. REPLACED APU.