What was found
RH AFT EXTERNAL OVERWING EMERGENCY LIGHT INOP-C/A-REMOVED AND REPLACED RH AFT EXTERNAL OVERWING EMERGENCY LIGHT LAMP IAW EMB AMM 33-50-10-000-801-A AND EMB AMM 33-50-10-400-801-A. DID NOT FIX. SUSPECT #4 EMERGENCY BATTERY AND POWER SUPPLY BAD. REMOVED AND REPLACED #4 EMERGENCY BATTERY AND POWER SUPPLY IAW EMB AMM 33-50-04-000-801-A, EMB AMM 33-50-04-400-801-A, EMB AMM 33-50-04-000-802-A. AND EMB AMM 33-50-04-400-802-A. OPS CHECK GOOD. NO MORE DEFECTS NOTED AT THIS TIME. END. BATTERY CHARGER ASSY P/N 11-0049 S/N 19233