As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CLIMB THROUGH FL50, THE NR 2 ENGINE SUDDENLY LOST POWER AND PROPELLER FEATHERED WITHOUT ANY WARNING INDICATIONS. THE ENGINE WAS SECURED AND THE FLIGHT RETURNED TO THE DEPARTURE POINT WHERE AN UNEVENTFUL SINGLE ENGINE LANDING WAS MADE. POST FLIGHT TROUBLESHOOTING LED TO THE REPLACEMENT OF THE AUTOFEATHER UNIT AND TORQUE SENSOR BEFORE THE ACFT WAS RETURNED TO SERVICE.