As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT CREW DISCOVERED RT THROTTLE STUCK. ACFT RETURNED TO BASE LANDED WITH OUT INCIDENT. UPON DISASSEMBLE THE THROTTLE CABLE WAS FOUND TO BE FROZEN AT THE ENG SIDE BETWEEN SHAFT AND THE PROTECTIVE SHEATH. THIS HAS HAPPENED ON OTHER ACFT OPERATED BY THIS FLIGHT SCHOOL AND HAS BEEN REPORTED TO THE MFG.