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 ILLUMINATED. APU WAS NOT RUNNING OR OVERHEATED. WHILE TROUBLESHOOTING HAD APU EMERGENCY SHUT DOWN. TROUBLESHOOT TO INCORRECT WIRING TO STARTER. CORRECTED WIRING PER AMM 49-40-00. INSPECTED APU FOUND NO EVIDENCE OF BOTTLE DISCHARGE. TESTED FIRE SYSTEM, NO FAULTS, STARTED APU 2 TIMES, NO FAULTS.