As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS IN BASE MAINTENANCE: INOPERATIVE EMERGENCY POWER SUPPLY UNIT (EPSU) ON EMERGENCY EXIT LEFT-HAND IN PASSENGER CABIN. REPLACED EMERGENCY POWER SUPPLY UNIT 11WL (EPSU) ON EXIT LEFT-HAND IN PASSENGER CABIN PER AMM 33-51-38-400-001-A.