As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1774 CLT-EEL- OPERATIONAL TEST OF EMERGENCY LIGHTS FAILED TEST STEP 5A, EPSU LOAD AFT LT. MAINTENANCE REMOVED AND REPLACED THE EMERGENCY POWER SUPPLY UNIT 13WL BATTERY PER AIRBUS MAINTENANCE MANUAL 33-51-38. OPERATIONAL TEST GOOD. (S)