What was found
IN CRUISE FLIGHT, PILOT EXPERIENCED TORQUE OSCILLATIONS AND YAW WITH CORRESPONDING TORQUE, TOT, N1 AND N2 INDICATIONS. REMOVED GOVERNOR AND FOUND SHAFT HARD TO TURN. A LARGE AMOUNT OF METAL PARTICLES WERE FOUND IN THE MOUNTING FLANGE AREA. FOUND DRIVE BEARINGS TO HAVE FAILED, SUSPECT A BEARING WASH-OUT. UNIT OVERHAULED TO MFG SPECS.