As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE CRUISING AT 25000 THE FLIGHT CREW NOTICED A SMALL SURGE IN POWER, THEN THE ENGINE RETURNED TO THE POWER SETTING. THIS OCCURRED ONCE MORE ON DESCENT, BUT O NCE AGAIN CLEARED UP. AFTER LANDING AIRCRAFT WAS GROUND RUN AND SURGES IN NG AND TORQUE WERE NOTICED . AIRCRAFT WAS GROUNDED AND FUEL CONTROL WAS REPLACED, THIS CORRECTED THE NG PROBLEM BUT WE STILL HAD TORQUE SURGES WE THEN REPLACED THE PR OP GOV P/N 8210-137 AND ENGINE WAS RIGGED AND GROUND RUN. PROBLEM WAS CORRECTED.