As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: INOPERATIVE EMERGENCY POWER SUPPLY UNIT 11WL IN PASSENGER CABIN. SYSTEM CHECK SHOWS FAULT WARNING EMERGENCY POWER SUPPLY UNIT 11WL AND SELF TEST OF THE UNIT GIVES UNIT FAULT LIGHT. REPLACED EMERGENCY POWER SUPPLY UNIT 11WL IN PASSENGER CABIN PER AMM 33-51-38-400-001-A