As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO THROTTLE DISENGAGED AND WOULD NOT STAY ENGAGED WHEN SELECTED. ACFT GROUNDED. UNABLE TO DUPLICATE/VERIFY DISCREPANCY. PERFORMED FIM 22-31 TASK 801. AUTOTHROTTLE FLIGHT FAULT REVIEW SHOWED ASM-2 RATE MONITOR FAULT. PERFORMED FIM 22-31 TASK 805, NUMEROUS CURRENT STATUS AND SERVO MOTOR TESTS GOOD.