As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING THE INITIAL CLIMB, THE NR 2 ENGINE HAD UNCONTROLLED TORQUE SURGE INDICATIONS. A PRECAUTIONARY ENGINE SHUTDOWN WAS CARRIED OUT AND THE FLIGHT RETURNED TO DEPARTURE. EXTENSIVE T/S HAS DETERMINED THAT THE ENGINE EXPERIENCED A LARGE OVERTORQUE AND THE CAUSE OF THE TORQUE FLUCTUATIONS ARE INTERNAL TO THE ENGINE. THE ENGINE IS BEING REPLACED.