As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE AND COMPLETING TASK CARD A320-33-51-00-710-003, UNABLE TO PERFORM TEST DUE TO EPSU BATTERY FWD LT FAULTED. CEILING PANEL 221BC, REMOVED FOR MAINTENANCE. REPLACED FWD LEFT BATTERY ON EPSU IAW AMM 33-51-38. OPS TESTED GOOD. CEILING PANEL 221BC REINSTALLED.