As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE VISIT: MAINTENANCE FOUND INOP EPSU-EMERGENCY POWER SUPPLY UNIT 10WL AND 11WL BATTERY IN PASSENGER CABIN (2 EA). REPLACED EPSU-EMERGENCY POWER SUPPLY UNIT 10WL AND 11WL BATTERY IN PASSENGER CABIN (2EA) IAW AMM 33-51-38-400-002-A. PERFORMED OPERATIONALTEST IAW AMM 33-51-38-400-002-A STEP 4.C; TEST IS OK. (SEE SDR # AALA201905249004)