As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT APU KICKED OFFLINE AND BOTH ENGINE CONTROL LIGHTS ILLUMINATED. GROUNDED - YES. APU PWR KICKED OFF LINE PRIOR TO ENG ELEC SYS PWR UP. POWERED DOWN ALL SYSTEMS AND REBOOTED SHIPS POWER- ALL FAULTS CLEARED. ACFT CLEAR FOR SERVICE REF AMM 71-00-00.