As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THROTTLE BALL SWIVEL HAD BACKED OFF FROM THREADED ROD END ON CABLE END. SWEDGE STAKES HAD COME LOOSE ALLOWING ROD TO BACK OFF AND DISENGAGE THROTTLE. PILOT SHUT ENGINE OFF. ALL NORMAL, LANDING, ETC. SUBMITTER SUGGESTS EITHER DRILLING HOLE CLOSE TO SWIVEL END FOR SAFETY WIRE OR POSSIBLY PINNING LOWER ASSY WITH COTTER PIN.