As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS RIGHT THROTTLE STICKS AT MID POSITION. NEED TO FORCE IT PAST MID POSITION TO SET THRUST. MAINTENANCE FOUND RIGHT ENGINE THROTTLE CONTROL BOX HAS BROKEN SHIELD, BLENDED EDGE OF BRACKET, REINSTALLED RIVETS AND VERIFIED THROTTLE OPERATION IAW EA 300983.