As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IT HAS BEEN REPORTED BY THE FLIGHT CREW THE EMERGENCY EVACUATION LIGHTING SYSTEM HAS BEEN FOUND TO BE DEFECTIVE. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACK AND MADE ALL REQUIRED CORRECTIONS AND OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 33-50-00. SYSTEM OPERATIONAL CHECK WAS NORMAL. THE AIRCRAFT HAS BEEN RETURNED TO SERVICE.