What was found
THREE HOURS INTO FLIGHT CLIMBING FROM FL 330 TO FL 370, EXPERIENCED SHUDDER, MUFFLED BOOM, EGT RISE TO 920 DEGREES, EGT WARNING LIGHT, ERP AND N1 LOSS FOLLOWED BY EGT DROP AND ENGINE FAILURE. SHUT DOWN ENGINE, VISUAL INSPECTION NO APPARENT PHYSICAL DAMAGE. FLIGHT CONDITIONS, SMOOTH, VMC. PERFORMED INSPECTION OF ENGINE PER MM 71-00-2 AND 71-00-46. WHICH REVEALED DAMAGE TO 8TH STAGE. ENGINE TO BE REPLACED.