As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE ACFT WAS BEING GROUND RUN BEFORE A FLIGHT AND WHEN CHECKING CARBURETOR HEAT OPERATION, THE PILOT PULLED THE CONTROL TO THE "ON" POSITION. AT THIS POINT THE CONTROL FELT VERY LOOSE AND THE PILOT THEN REALIZED THAT THE CABLE HAD FAILED AS THE SEPARATED PART WAS PULLED INTO THE COCKPIT. THE ACFT WAS SHUTDOWN AND THE INCIDENT REPORTED TO MX. THE AFFECTED PART WAS REPLACED AND THE ACFT RETURNED TO SERVICE.