What was found
(CAN) AIRCRAFT ENROUTE TO MONTERREY, THE CREW WERE UNABLE TO RETARD THE LEFT HAND THROTTLE LOWER THAN 95 PERCENT. THE CREW RETURNED TO MEMPHIS AND CARRIED OUT QRH ABNORMAL 1-14. MECHANICS FOUND THE HOLD OPEN STRUT OF THE LT ENGINES UPPER CORE COWL JAMMED BETWEEN THE FUEL CONTROL UNIT INPUT SHAFT AND THE COWLING. THE STRUT WAS REMOVED (DMI) AND THE AIRCRAFT RETURNED TO SERVICE.DURING THE PRELIMINARY INVESTIGATION THE BALL WITHIN THE PIN BLC38C11SL5C4 WAS FOUND TO BE MISSING. THE STRUT STOWING END, BRACKET 228-50182-585 AND THE CLIP 228-50583-101 WILL BE VERIFIED UPON INSTALLATION OF NEW ROD TO CONCLUDE THE INVESTIGATION.