As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT MOB, CREW REPORTED APU FAULT / AUTO SHUTDOWN AND SMELL OF FUMES (FUEL) IN CABIN. AIRCRAFT RETURNED TO GATE. MAINTENANCE INSPECTED AND TROUBLESHOT, FOUND A CONNECTOR PIN SHORTED TO GROUND, REPAIRED WIRING AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.