As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A PREFLIGHT INSPECTION FLIGHT CREW REPORTED A PORTION OF THE EMERGENCY EVACUATION LIGHTING SYSTEM WAS INOP THE FIRST THREE METERS. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 33-50-00. THE AIRCRAFT HAS RETURNED TO SERVICE.