As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK/DECLARED EMERGENCY -- AFTER TAKEOFF AT 1000FT APU FIRE, FIRED BOTTLE RAN QRH RETURNED TO FIELD NORMAL LANDING AT 116.5, MINIMAL BRAKING. FOUND DAMAGE WIRE FWD BULKHEAD OF APU COMPARTMENT. REPAIRED WIRE AS PER STANDARD WIRING PRACTICE MANUAL. REMOVED AND REPLACED CONNECTOR PER SWPM.