As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENGINE WOULD NOT REDUCE BELOW 80 PERCENT TORQUE. CREW INITIATED ENGINE SHUT DOWN. FLIGHT LANDED SAFELY WITHOUT FURTHER INCIDENT. DIRECTOR OF OPERATIONS NOTIFIED THE FAA. FOUND HMU GEARBOX INDEX PLATE HAD FALLEN OFF. RE-INSTALLED AND RIGGED.