As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT COULD NOT REDUCE POWER TO RT ENGINE DURING FLIGHT, RT ENGINE WAS FEATHERED FOR LANDING. INSPECTION REVEALED POWER CABLE ATTACH POINT AT FUEL CONTROL UNIT JAM NUT BACKED OFF ALLOWING THE CABLE TO SLIP. TIGHTENED JAM NUT. CHECKED RIGGING, OPS CHECK GOOD.