As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOTHROTTLE DISENGAGED DURING TAXI WILL NOT REENGAGE. GROUNDED - YES. FLIGHT FAULT REVIEW LAST 2 LEGS SHOWS 33 FAULTS, ALL THE SAME CHAN-A MAINTENANCE MESSAGE 22-31543 A/T ENG 28 VDC INV. PERFORMED B737-800 FIM 22-31 TASK 802 FOR FOUND FAULT MAINT CODE 22-31543 AND FIM 22-31 TASK 801 A/T CURRENT STATUS, INTERACTIVE SERVO MOTOR TESTS PERFORMED NUMEROUS TIMES WITH NO DISCREP. PER FIM, INTERMITTENT FAULT.