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 10WL BATTERY AT LH FWD GALLEY AREA 1 (EA); (REF AEROMAN WO 2021-83/1, NR 2021-152456) R & R BATTERY EPSU FIN (10WL) IAW AMM 33-51-38-400-002-A. PERFORMED OPERATIONAL TEST IAW AMM 33-51-00-710-001-A. TEST IS OK.