As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER GEAR RETRACTION RECEIVED APU FIRE WARNING. FOLLOWED AMJ PRECEDURES. MAINTENANCE ACCOMPLISHED AN APU INSPECTION. NO SIGNS OF FIRE NOTICED. OPERATIONAL AND FUNCTION CHECKS WERE PERFORMED PER THE AMM ALL OK. THE APU FIRE BOTTLE WAS REPLACED.