As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE BOTTLE INDICATES DISCHARGED ON THE OVERHEAD PANEL. INSPECTION OF APU BAY AND FOUND NO EVIDENCE OF A FIRE BOTTLE DISCHARGE. TROUBLESHOT IAW TSM 26-22-00-810-806-A. REMOVED AND REPLACED THE APU FIRE EXTINGUISHER BOTTLE IAW AMM 26-22-41.