What was found
FOR FLIGHT 3704 DURING PREFLIGHT INSPECTION THE CREW FOUND THE CABIN EMERGENCY LIGHTS WOULD NOT TEST. (FOUND THE FLIGHT ATTENDANT PANEL LIGHT SWITCH ON) THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE EMEREGENCY POWER SUPPLY BATTERIES 1, 2, 3 AND 4. PART NUMBER 2013-1A AND SERIAL NUMBERS: NR 1 67508, NR 2 104847, NR 3 74160, NR 4 81257. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.