What was found
(CAN) ABOUT 1 HR INTO FLT CREW NOTED A SLIGHT FLUNCTUATION IN RT ENGINE TORQUE ALONG WITH A REDUCTION IN ENGINE NG SPEED. ITT ALSO INCREASED 50 DEGS HIGHER THAN NORMAL FOR CRUISE POWER.THE CREW MONITORE ENGINE PARAMETERS & NOTED A FURTHER DECREASE IN NG TO BELOW NORMAL OP LIMITS WITH INCREASES IN ITT. REW ELECTED TO SHUTDOWN ENGINE IN ACCORD WITH AFM AND SOP'S & RETURNED TO MAIN BASE FOR FURTHER INVEST.. A/C LANDED W/O FURTHER INCID..MAINT INSP OF ENGINE REVEALED THAT ACCESSORY SECTION /GAS GEN GROUP HAVE SIGNS OF INTERNAL DAMAGED AS INDICATED BY INABILITY TO ROTATE SEVERAL OF DRIVES. NO FURTHER TEAR DOWN OF ENGINE WILL TAKE