As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATL - EEL - DURING 4-DAY CHECK FUNCTIONAL TEST OF EMERGENCY LIGHT SYSTEM FOUND THE RT OVERWING EMERGENCY POWER SUPPLY UNIT INOPERATIVE. MAINTENANCE REMOVED AND REPLACED RT OVERWING EMERGENCY POWER SUPPLY UNIT (12WL), OPERATIONAL CHECK WAS GOOD.