As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: DURING EMERGENCY POWER SUPPLY UNIT TEST PER AMM 33-51-00 FOUND CFDS FAULT, EMERGENCY POWER SUPPLY UNIT 13WL. FOUND EMERGENCY POWER SUPPLY UNIT 13WL BATTERY INOPERATIVE, REPLACED BATTERY AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-00.