As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORMED SHUTDOWN OF THE APU. APU FIRE MESSAGE FOLLOWED EPC, FIRE STILL SHOWED. AFTER PRESSING THE FIRE EXTINGUISHER BOTTLE, THE FIRE NOW SHOWS OUT. GVI INSPECTION, NO FIRE NOTED. HAD TAIL WIND NOTED. REMOVED AND REPLACED THE APU FIRE DETECTOR IAW AMM 26-12-01. OPS CHECKED GOOD.