As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: EMERGENCY POWER SUPPLY UNIT 13WL AND BATTERY ARE INOPERATIVE. REPLACED EMERGENCY POWER SUPPLY UNIT 13WL (AALA202512159172) AND BATTERY (AALA202512165479) PER AMM 33-51-38. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ISSUES NOTED.