As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN PUSHING TO/GA BUTTON FOR TAKEOFF NR 1 ENGINE THRUST LEVER DOES NOT ADVANCE, A/T SWITCH DISENGAGES WITH ACCOMPANING RED FLASHING A/T. NO BINDING OF THRUST LEVERS WHEN MOVED MANUALLY. ACFT GROUNDED. A/T SERVO MOTOR TEST FAILED NR 1 ASM MESSAGE 22-31794, NR 1 THROTTLES DO NOT MOVE. REMOVED AND REPLACED THE NR 1 ASM IAW AMM 22-31-91, OPS CHECKED NORMAL.