As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING INSPECTION, ENGINE CONTROL CHECK, IT WAS NOTICED THAT THE MIXTURE STOP PIN WAS MISSING. THE PIN IS FRICTION FIT ONLY, INSPECTION OF THE HOLE WITH A 10X MAGNIFIER REVEALED NO DAMAGE TO THE HOLE. A SERVICEABLE PIN REMOVED FROM ANOTHER PUMP WAS INSTALLED USING LOCTITE AS RECOMMENDED BY O/H FACILITY. CONTROL CHECK WAS CARRIED OUT NO FAULT FOUND AND ACFT RETURNED TO SERVICE.