What was found
DURING CLIMB 200 FEET GSL, THE NR 4 ENGINE N1 WENT TO MAX SPEED FOLLOWED BY A LOUD BANG AND COMPRESSOR STALL. THE ENGINE WAS SHUT DOWN, 129,000 POUNDS OF FUEL WAS DUMPED, AND THE AIRCRAFT RETURNED TO ANC WHERE AN UNEVENTFUL THREE ENGINE LANDING WAS ACCOMPLISHED. THE NR 4 ENGINE WAS REPLACED. CORRECTION: A/C TT 49888 CHANGED TO 49887, S/N 602954 CHANGED TO S/N 689481, PART TOTAL TIME 71028 CHANGED TO 49887, PART TOTAL CYCLES 17360 CHANGED TO 12345, PART TIME SINCE 4740, AND PART DEFECT LOC. NR 3 POSITION CHANGED TO NR 4 POSITION.