What was found
AUTOTHROTTLES DISENGAGE AFTER ENGAGEMENT. WHEN THROTTLES BEGIN TO MOVE ONLY NR 2 THROTTLE MOVES THEN DISENGAGES. ON DEFERRAL. A/T CURRENT STATUS SHOWS NO FAULTS, A/T SERVO TEST PASS. FFR SHOWS 11 FAULTS ON LEG 2 MESSAGE 22 31687 ASM NR 1 LEGS 3 40 NO FAULTS. ACCOMPLISHED FIM 22 32 00 810 819. THROTTLES MOVE SMOOTH THROUGH ALL RANGES. WILL REQUIRE NR 1 ASM CHANGE. DUE TO HISTORY SUSPECT CURRENT INSTALLED ASM NR 1 BAD FROM VENDOR. SUGGEST REPLACING NR 2 ASM PRECAUTIONARY. REPLACED NR 2 (RT)AUTOTHROTTLE SERVO MOTOR WITH SERVICABLE ONE. ACCOMP INST TEST TEST PASS. REPLACED NR 1 A/T SERVO MOTOR PER MM 22 31 91. TESTS GOOD PER SAME.