As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON DESCENT, THE PILOT WAS UNABLE TO REDUCE THE RT ENGINE DOWN TO IDLE. THE SITUATION WAS CONTROLLED BY SLOWING THE HELICOPTER RATE OF DESCENT. THE PILOT LANDED THE HELICOPTER SAFELY. THE TROUBLESHOOTING REVEALED NO FAULT CODE, AND THE MECHANIC WAS UNABLE TO REPRODUCE PROBLEM ON GROUND. THE FMM IS BEING REMOVED.