What was found
AIRCRAFT IN BASE MAINTENANCE: INOPERATIVE EPSU-EMERGENCY POWER SUPPLY UNIT (11WL) IN PASSENGER CABIN. REPLACED EMERGENCY POWER SUPPLY UNIT (EPSU)(11WL)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRCRAFT IN BASE MAINTENANCE: INOPERATIVE EPSU-EMERGENCY POWER SUPPLY UNIT (11WL) IN PASSENGER CABIN. REPLACED EMERGENCY POWER SUPPLY UNIT (EPSU)(11WL)