As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ON TAXI-OUT AN APU AUTO SHUTDOWN. CREW ELECTED TO RETURN TO THE GATE WITHOUT INCIDENT. MAINTENANCE INSPECTED AND DEFERRED THE APU PER MEL 49-10-01-1. MAINTENANCE PROPERLY SERVICED THE APU OIL LEVEL IN ACCORDANCE WITH THE AIRCRAFT MAINTENANCE MANUAL. OPS CHECKS OF THE APU WERE GOOD, NO DEFECTS WERE NOTED. MEL WAS CLEARED. AIRCRAFT WAS RELEASED FOR SERVICE.