As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT, APU FIRE BELL AND LIGHTS ACTIVATED. APU FIRE CHECKLIST PERFORMED BUT DID NOT STOP BELL RINGING OR LIGHTS FLASHING. SELECTED FIRE WARNING SYSTEM "A" AND CONDITION CLEARED. INSPECTED APU COMPARTMENT AND FOUND NO EVIDENCE OF FIRE. FOUND APU FIRE WARNING LOOP "A" AND "B" INOPERATIVE. DEACTIVATED APU AND DEFERRED IAW DDPG PROCEDURES.