What was found
AUTOTHROTTLES FAILED AND WOULD NOT RE-ENGAGE. TRIED BOTH AUTOPILOT`S AND FLIGHT DIRECTOR`S. DID NOTICE THAT WHEN AUTOTHROTTLES WERE ENGAGED, THE RT THRUST LEVER WOULD NOT MOVE WHILE THE LT ONE DID-AT THAT TIME THE AUTO THROTTLES WOULD DISCONNECT. ACFT GROUNDED. ACCOMPLISHED A/T BITE IAW FIM 22-31, TASK 801. LEG 01, LOGGED ASM 2 FAULT CODE 22-31688, 6 TIMES. A/T SERVO MOTOR TEST FAILS FOR ASM 2 REF FIM 22-31, TASK 805. REPLACED A/T SERVO MOTOR IAW AMM TASK 22-31-91-020-801 AND 22-31-91-400-801. INSTALLATION AND SERVO MOTOR TEST PASSED IAW SAME.