As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE: EPSU 13WL AFT L BAT FAILED TEST; REMOVED & REPLACED 13WL ESPU BATTERY IAW A321 AMM 33-51-38.EPSU BITE TEST DONE. IAW A32AMM 33-51-00-710-001 & CIDS INTERFACE & POWER UP TEST DONE IAW A321 AMM 23-73-00-740-005.TESTS OK REF STS WO 004320 N0382