As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY POWER SUPPLY UNIT (EPSU) 14WL "BATT FAULT". EMERGENCY POWER SUPPLY UNIT (EPSU) 14WL BATERY WAS REPLACED IAW A321 AMM 33-51-38-000-002-A AND 33-51-38-400-002-A. OPERATIONAL CHECK OF EPSU BY BITE CHECK WAS PERFORMED. TEST PASSED. (LP#1997333)