As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW EXPERIENCED AN APU STARTER FIRE UPON ARRIVING TO GATE AFTER FLIGHT. RAMP PERSONNEL NOTIFIED MAINTENANCE THAT HEAVY SMOKE, WAS COMING OUT OF APU COMPARTMENT. MAINTENANCE OPENED LT APU ACCESS DOOR AND FOUND STARTER ON FIRE. GROUND BASED FIRE EXSTINGUISHER DISCHARGED. NO COCKPIT FIRE INDICATION. R & R APU IAW AMM. CLEANED APU COMPARTMENT OF EXTINGUISHING AGENT. OPERATION CHECKS OK.