As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6414 - IAD-GSO - DURING CRUISE, AIRCRAFT MADE AN UNSCHEDULED LANDING AT IAD DUE TO RT ENGINE LOST TORQUE. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED RT ENGINE. OPS CHECK OK, AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)