As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE WARNING WITH BELL DURING TAXI. C/W QRH. FIRE BOTTLE BLOWN. MEL 28MAY26 17:44 APU FIRE EXTINGUISHING. T/S IAW FIM 26-22-00-810-802A. FOUND SHORTED CANNON PLUG AT APU FIRE EXTINGUISHER BOTTLE. R & R ELECTRICAL CONNETOR IAW SWPM 20-50-00. REMOVED AND REPLACED APU FIRE BOTTLE IAW W/C 26-22-01. OPS CK GOOD. CLEAR MEL. A/C OK FOR SERVICE.