What was found
(CAN) AFTER LANDING, PILOT RETARDED THROTTLE CONTROL TO IDLE, WITH ENGINE NOT RESPONDING. ATTENDING AME DISCOVERED THE THROTTLE CONTROL LEVER ON FCU WAS DISCONNECTED, PIN & CIRCLIP ARRANGEMENT. THE PIN, FOUND ON ENGINE DECK WAS RE-INSERTED AND DECELERATION, SHUTDOWN COULD BE COMPLETED. THE CIRCLIP PART OF THE LOCKING ARRANGEMENT WAS NEVER FOUND. AFFECTED PARTS, PIN PN:0164162870 & CIRCLIP PN:9560610090, REPLACED, ACFT RTS.