What was found
DURING CLIMB, THE EMERGENCY EXIT SIGN LOCATED AT OVERHEAD AISLE MID-CABIN POSITION BECAME INOPERATIVE, FOLLOWED BY THE EXIT SIGN AT THE R/H OVER WING EXIT. THE AIRCRAFT CABIN R/H SIDE EMERGENCY ESCAPE PATH LIGHTING WAS ALSO INTERMITTENTLY ILLUMINATING DURING FLIGHT. MAINTENANCE REMOVED AND REPLACED THE R/H MID CABIN EMERGENCY LIGHT BATTERY PACK AT EMERGENCY POWER SUPPLY UNIT 12WL IAW AMM TASK 33-51-38-400-002; OPERATIONAL CHECK WAS GOOD.