As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER START UP OF ENGINES, ACFT BEGAN TO TAXI AND THE PILOT REPORTED RT THROTTLE LEVER BECAME UNRESPONSIVE DURING TAXI. THEY RETURNED AND AFTER TROUBLESHOOTING IT WAS DETERMINED THE CONTROL ASSY, PN 7-43489-2, FOR THE RT ENGINE HAD SHEARED IN HALF, 6" FROM THE END AT THE ENGINE SIDE CONNECTION.