What was found
IN FLIGHT FROM PANC TO RKSI, CREW HAD NO FORWARD THROTTLE MOVEMENT RESPONSE ON ENGINE NR 3, THE ENGINE RESPONDED NORMALLY DURING RETARDING THROTTLE MOVEMENT. CREW SHUT DOWN ENGINE NR 3 AS PRECAUTION ON TOP OF DESCENT INTO RKSI AND LANDED SAFELY AT RKSI. AFTER LANDING, MAINTENANCE CREW TROUBLESHOT ENGINE NR 3 THROTTLE SYSTEM AND FOUND THE THROTTLE DRUM PUSH-PULL CABLE CONTROL BOX INSIDE THE NR 3 ENGINE PYLON WORN. REMOVED AND REPLACED WORN CONTROL BOX AND PERFORMED THROTTLE CONTROL SYSTEM ADJUSTMENT TEST ON ENGINE NR 3 IN ACCORDANCE WITH BOEING 747 AMM 76-11-06 AND 76-11-00, ALL OPERATION NORMAL. AIRCRAFT RESTORED TO NORMAL.