As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO THROTTLES STOPPED WORKING AND WOULD NOT RE-ENGAGE. GROUNDED - YES. A/T INFLT FAULTS SHOWED NO A/T FAULTS LAST 22 LEGS. LEG 23 HAD ASM 2 RATE MONITOR FAULT. PERFORMED B737-900 FIM 22-32 TASK 819, INITIAL EVALUATION TEST GOOD. SERVO MOTOR TEST PERFORMED NUMEROUS TIMES W/NO FAULTS. PER FIM INTERMITTENT FAULT.