What was found
(CAN) SHORTLY AFTER TAKEOFF, THE CREW NOTED THAT LT ENGINE THROTTLE COULD NOT BE RETARDED FROM 92 PERCENT. CREW ELECTED TO SHUT ENGINE DOWN WITH FIRE/PUSH PBA. A/C MADE AN UNEVENTFUL LANDING. SUBSEQUENT INSPECTION REVEALED THAT THE CORE COWL SUPPORT STRUT HAD NOT BEEN PROPERLY SECURED IN CORE COWL WITH SNAP RETAINER AND LOCKPIN AFTER LAST ACCESS. WHEN THE STRUT FELL BACK DOWN ON THE ENGINE, IT FOULED AND APPARENTLY RESTRICTED MOVEMENT OF THE THROTTLE CONTROL BOX LINKAGE TO THE FUEL CONTROL.