What was found
WHILE CLIMBING PAST FL320 (AMS), THE NR 4 ENGINE EPR AND FUEL FLOW INDICATIONS BEGAN TO FLUCTUATE WITH EGT RISING INTO THE CAUTION RANGE. THE ENGINE WAS SHUT DOWN, FUEL WAS DUMPED, AND THE AIRCRAFT RETURNED TO AMS AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS THEN CONFIGURED FOR A THREE ENGINE FERRY FLIGHT TO MSP. EXACT PART CAUSING PROBLEM TO BE DETERMINED.