As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING DESCENT, WHEN RETARDING PL, THE RIGHT HAND ENGINE POWER KEPT DISCHARGING. TORQUE WAS AROUND 800, NG VALUE WAS NOT CONFIRMED. THE PILOT SET THE RIGHT HAND PROPELLER TO FEATHER. A SAFE LANDING WAS MADE. TROUBLESHOOTING ONGOING.