As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE, INOP EPSU BATTERY FIN 13WL AT PASSENGER CABIN; (REF AEROMAN WO 2021-83/1, NR 2021-152451) R & R BATTERY EPSU FIN (13WL) IAW AMM 33-51-38-400-002-A. PERFORMED OPERATIONAL TEST IAW AMM 33-51-00-710-001-A. TEST IS OK.