What was found
FOR THE LAST THREE MORNINGS DOWNWASH AND AISLE LIGHTS AT SEAT FOUR AND THE RT WING. INSPECTION LIGHT WILL NOT TEST WHEN THE EMERGENCY LIGHT SWITCH IS SELECTED ON. THE DOWNWASH & EXTERIOR WING INSPECTION LIGHTS ARE OUT & AISLE LIGHT IS EXTREMELY DIM. AFTER ABOUT 3 MINS OF CHARGING WITH APU, DOWNWASH & AISLE LIGHTS FINE. REMOVED DEFECTIVE NR 1 BATTERY PACK UC019, & INSTALLED A NEW BATTERY PACK REMOVED DEFECTIVE NR 2 BATTERY PACK UC003 & INSTALLED A NEW BATTERY PACK. REMOVED NR 3 BATTERY PACK UF903 & INSTALLED A NEW BATTERY . REMOVED NR 4 BATTERY UC018 & INSTALLED A NEW BATTERY. PERFORMED OPS TEST OF EMERGENCY LIGHT POWER SUPPLY. OP'S TESTED GOOD IAW AMM 33-50-06.