As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOR FLIGHT 3546 THE CREW REPORTED THAT WHEN THEY ARRIVED AT THE AIRCRAFT THE EMERGENCY LIGHTS WERE ON. THE AIRCRAFT HAD BEEN UNOCCUPIED FOR AT LEAST 25 MINUTES AND COULD NOT DETERMINE STATUS OF THE EMERGENCY LIGHT BATTERIES. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE NR 1 & 4 EMERGENCY BATTERY PACK IAW MM 33-50-04. THE AIRCRAFT WAS RETURNED TO SERVICE.