As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON COMPLETION OF A ROUTINE TRAINING FLIGHT, THE PILOT REPORTED THAT THE LT CARBURETOR HEAT CONTROL FELT LOOSE. UPON CLOSER INSP BY MX, IT WAS DISCOVERED THAT THE CABLE ASSY HAD FAILED WHERE THE FLEXIBLE CABLE IS SWAGED TO THE LEVER END ROD. INNER CABLE WAS SEVERELY FRAYED TO THE POINT WHERE IT WAS NEARLY OR COMPLETELY SEPARATED. UNSERVICEABLE CABLE ASSY WAS REMOVED AND REPLACED WITH A NEW PART.