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 -EMERGENCY POWER SUPPLY UNIT IN PASSENGER CABIN 13WL; REF AEROMAN WO 2020-82/1 WCC 2020-79279- REMOVED AND REPLACED EPSU IN POSITION 13WL IAW AMM 33-51-38-400-001. AND PERFORMED CHECK OF THE EMERGENCY POWER SUPPLY UNIT BY BITE CHECK IAW A320 AMM 33-51-00-710-001-A. TEST IS OK. / "