What was found
DURING CRUISE AT FL330, SMOKE BEGAN POURING FROM THROTTLE QUADRANT. DISCONNECTED AUTOTHROTTLES, AUTOPILOT & SMOKE QUICKLY DISSIPATED. EMERGENCY DECLARED AND REQUESTED PRIORITY HANDLING TO STANSTED UK. PER CREW DEBRIEF SMOKE DISAPPEARED SIMULTANEOUSLY WITH MANUAL DISCONNECTION OF AUTOTHROTTLES. PERFORMED FCC-1 THRUST CONTROL MODULE RTS TEST PER MM 22-00-00-5. TEST FAILED FOR A/T SERVO WITH NO THROTTLE MOVEMENT DURING TEST. PERFORMED FCC-2 THRUST CONTROL MODULE RTS TEST PER MM 22-00-00-5 & ALL TESTS PASSED. SUSPECT NR 1 A/T SERVO FAILURE WITHIN THE TCM WAS CAUSE OF SMOKE. REQUIRES REPLACEMENT OF THE THRUST CONTROL MODULE.