What was found
AUTOTHROTTLE ARMED FOR TAKEOFF AND DISCONNECTED AT TOGA ON TAKEOFF. ADVANCED THROTTLES MANUALLY. ATTEMPTED TO REENGAGE BUT THE AUTOTHROTTLE DISENGAGED AGAIN. ACFT GROUNDED. FAULT HISTORY SHOWED NR 2 AUTOTHROTTLE SERVO MOTOR FAILURE, FOR 7 LEGS. NO OTHER FAULTS LOGGED LAST 30 LEGS. PERFORMED AUTOTHROTTLE OPS CHECK IAW AMM TASK 22-31-00-710-801, NO DEFECTS NOTED. PERFORMED AUTOTHROTTLE SYSTEM TEST IAW AMM TASK 22-31-00-710-802, NO DEFECTS NOTED. PERFORMED LAND VERIFY TEST IAW AMM TASK 22-11-00700-801, NO DEFECTS NOTED.