As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF, NR 1 ENGINE HAD A 20 PERCENT TORQUE ROLLBACK. POWER LEVER WAS ADVANCED TO RESTORE POWER. AFTER CRUISE ESTABLISHED, THERE WAS AN ABRUPT UNCOMMANDED INCREASE IN TORQUE. AFTER NORMAL ARRIVAL, THE HYDRO MECHANICAL UNIT, THE FUEL PUMP WERE REPLACED.