What was found
NR 4 ENGINE HAD COMPRESSOR STALL AFTER THROTTLES RETARDED AT TOP OF DESCENT. EGT INCREASED TO 490 DEGREES. INFLIGHT SHUT DOWN ACCOMPLISHED. INFLIGHT START ATTEMPTED, LIGHT OFF EGT INCREASING, LOW N2, LOW FUEL FLOW AND EGT INCREASING TO 480 DEGREES. SHUT DOWN ENGINE. REPLACED FUEL CONTROL UNIT PER BOEING MAINTENANCE MANUAL 73-21-01. AFTER FUEL CONTROL CHANGE, REPLACED ENGINE VANE CONTROL PER BOEING M/M 75-31-02. ENGINE VANE CONTROL CONFIRMED AS CAUSE OF STALL.