What was found
CREW REPORTED LEFT THRUST LEVER WAS JAMMED IN POSITION DURING FLIGHT. CREW FOLLOWED QRH (QUICK REFERENCE HANDBOOK), SHUT DOWN LEFT ENGINE AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND FOUND LEFT ENGINE AFT CORE UPPER COWL UPPER SUPPORT ROD DISCONNECTED AND JAMMED, BLOCKING FUEL CONTROL ROD. SUPPORT ROD WAS MISSING ITS KEEPER BOLT. MAINTENANCE INSTALLED NEW SECURING PIN ON LEFT ENGINE UPPER CORE COWL USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.