What was found
(CAN) DURING FLIGHT WITH POWER SETTINGS IN CRUISE THE CREW NOTICED A CHANGE IN THE SOUND FROM THE #2 ENGINE, IT WAS ALSO NOTED THE BETA LIGHT WAS ON. THE PROP RPM WAS INCREASING AND THE TORQUE WAS DECREASING AND THE AIRCRAFT BEGAN TO YAW. THE YAW HAD TO BE CORRECTED BY THE RUDDER PEDALS, SO THE #2 ENGINE WAS SHUTDOWN. POST FLIGHT INSPECTION, GROUND RUN AND FLIGHT TEST COULD NOT DUPLICATE THE FAULT. SUSPECT INTERMITTENT PROPELLER GOVERNOR FAULT. PROPELLER GOVERNOR SENT FOR TESTING.