As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
8-DAY CHECK - DURING FUNCTIONAL CHECK OF THE EMERGENCY LIGHT SYSTEM THE RT OVER WING EMERGENCY LIGHT BATTERY PACK FAULTED. MAINTENANCE REMOVED AND REPLACED THE RT EMERGENCY LIGHT BATTERY PACK AT EMERGENCY POWER SUPPLY UNIT (12WL), OPERATIONAL CHECK WAS GOOD.