As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PILOT WILL LOOSEN THE FRICTION KNOB ON THE ENGINE CONTROL QUADRANT AND THE LITTLE PIECES THAT LOCK AROUND THE CONDITION LEVER GET COCKED AND JAMMED. SO THE PILOT WILL THEN SCREW THE FICTION KNOB OUT EVEN FURTHER UNTIL IT IS COMPLETELY UNSCREWED THE FLAP LEVER FALLS OFF INSIDE THE ENGINE CONTROLS QUADRANT. THERE IS NO PHYSICAL STOP TO KEEP THE FICTION KNOB FROM COMING ALL THE WAY OFF.