As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTHTHROTTLE ARM SWITCH WILL NOT ENGAGE DURING TAXI OUT. ACFT GROUNDED. AUTOTHROTTLE FAULT HISTORY SHOWED 1 LEG SHOWING FAULT 22-31543 AUTOTHROTTLE INTERNAL PROBLEMS. ACCOMPLISHED FIM 22-31, TASK 802. NO CURRENT FAULTS FOR AUTOTHROTTLE OR DFCS. INTERMITTENT FAULT.