What was found
DURING A ROUTINE OVERNIGHT SERVICE CHECK INSPECTION, MAINTENANCE DEPARTMENT PERSONNEL REPORTED THE RIGHT AND LEFT OVER WING EXIT LIGHT, FWD EMERGENCY EXIT DOOR (L1)AND THE LEFT FWD FLOOR EMERGENCY EXIT LIGHT INOP WOULD NOT TEST. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE APPROPRIATE POWER SUPPLY BATTERY PACKS. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 33-50-00. THE AIRCRAFT HAS RETURNED TO SERVICE.