As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, THE INSTRUCTOR PILOT REPORTED THE THROTTLE LEVER WOULD BECOME STUCK AS THE LEVER WAS ADVANCED. MECHANICS WERE ABLE TO REPLICATE THE MALFUNCTION ON THE GROUND. FURTHER INSPECTION REVEALED THE CARBURETOR THROTTLE VALVE WAS BECOMING STUCK AS THE VALVE WAS OPENED. THE CARBURETOR WAS REPLACED.