What was found
AFTER STARTING ENGINES AND CALLING FOR THE AFTER START CHECKLIST AND COMPLETING FLOW, I HEARD AUTO THROTTLE SERVO S AND NOTICED UNCOMMANDED THROTTLE ADVANCEMENT. I RETARDED THROTTLES AT ABOUT 30% N1 AND DISCONNECTED. THRUST FMA WAS THR REF. TURNED FLT DIRECTORS OFF AND BACK ON TO RESET TAKEOFF MODE. RE-ENGAGED A/T AND MONITORED WHILE RUNNING BEFORE TAKEOFF . DURING TAXI OUT, TAKEOFF, AND REST OF FLIGHT AUTOTHROTTLES WORKED NORMALLY. NO EICAS MSG AND MX MSG, PERFORMED LEFT & RIGHT TMCF - AUTOTHROTTLE SERVO LOOP FOR TMCS SYSTEM TEST IAW AMM 22-31-00-5. ALL TESTS PASSED. NO EICAS MSG AND MX MSG, PERFORMED LEFT & RIGHT TMCF - AUTOTHROTTLE SERVO LOOP FOR TMCS SYSTEM TEST IAW AMM 22-31-00-5. ALL TESTS PASSED.