As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE CAS DISPLAYED IN FLIGHT. FOLLOWED QRH, BOTTLE NR 2 BLOWN. LANDED WITHOUT INCIDENT. INSPECTED APU ENCLOSURE FOR POSSIBLE APU FIRE. FOUND NO SIGNS OF ACTUAL APU FIRE. R & R NR 2 FIRE BOTTLE AND BOTH LOWER APU ENGINE MOUNT INSULATORS. OPS CHECKED THE FIRE SYSTEM WAS GOOD.