As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOTHROTTLE SYS INOP WOULD NOT ENGAGE. GROUNDED - YES. PERFORMED BITE CHECK FOR AUTOTHROTTLE PER B737-800 FIM 22-31 TASK 801. NO CURRENT FAULT IS FOUND AND FOUND FAULT HISTORY OF MSG 22-31781 PERFORMED GOOD SERVO MOTOR TEST OF INTERACTIVE THROTTLE TESTS MULTIPLE TIMES . TEST PASS, FAULT WAS INTERMITTENT FAULT.