As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: DONT WORK CORRECTLY (EPSU) EMERGENCY POWER SUPPLY UNIT 12WL IN PASSENGER CABIN. MAINTENANCE REPLACED EPSU) EMERGENCY POWER SUPPLY UNIT 12WL IN PASSENGER CABIN IAW AMM 33-51-38-000-001-AAND AMM 33-51-38-400-001-A.