What was found
ON PREFLIGHT THE EMERGENCY LIGHT SYSTEM IS INOPERATIVE. THE READING LIGHT ABOVE THE LAV, THE EXIT SIGN UNDER THE LAV, THE FLOOR LIGHT UNDER THE LAV AND THE EXIT SIGN ON THE BULKHEAD BEHIND SEAT 7 ARE ALL INOPERATIVE. LAV, THE FLOOR LIGHT UNDER THE LAV AND THE EXIT SIGN ON THE BULKHEAD BEHIND SEAT 7 ARE ALL INOPERATIVE. FOUND DEFECTIVE NR 4 EMERGENCY LIGHTING BATTERY. REMOVED DEFECTIVE NR 4 EMERGENCY LIGHTING BATTERY AND INSTALLED REPAIRED UNIT WITH GOOD OPS CHECKS. REF: CE·680A AMM 33-50-06.