As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: APU AGENT DISCHARGE LIGHT ON NO FIRE INDICATION. MAINTENANCE ACCOMPLISHED APU FIRE DISCHARGE UNIT TEST WITH NO FAULTS NOTED, ACCOMPLISHED A SATISFACTORY OPERATIONAL TEST OF THE APU FIRE EXTINGUISHING SYSTEM PER AMM 26-22-00-710-001-A. INSPECTED FIRE EXTINGUISHING SYSTEM COMPARTMENT PER 26-22-00-0501, 0601,NO SIGN OF FIRE BOTTLE DISCHARGE.