As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON DESCENT FOR LANDING, RIGHT ENGINE HORSE POWER WOULD NOT REDUCE BELOW 200 HORSE POWER WITH THE POWER LEVER AT FLIGHT IDLE. UPON LANDING, RIGHT ENGINE HORSE POWER REMAINED AT APPROXIMATELY 100 HORSE POWER UNTIL AIRCRAFT SLOWED DOWN TO 50 KIAS. AT THAT POINT THE RIGHT ENGINE BETA LIGHT ILLUMINATED AND HORSE POWER DROPPED TO ZERO.