As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: BATTERY PACK AT PASSENGER ENTRY DOOR-3 (OVERHEAD PANEL) FAILS OPERATIONAL CHECK LEFT HAND. REMOVED, REPLACED AND PERFORMED SATISFACTORY TEST OF LEFT PASSENGER ENTRY DOOR 3 (OVERHEAD PANEL) OFF WING SYSTEM BACKUP BATTERY PER TC 72C80052020 AND AMM 52-12-24.