As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT A DISCONNECTED IN CRUISE FLIGHT. GROUNDED - YES. INSPECTED AND FOUND FAULT MESSAGE 22-11186 SEVERAL TIMES IN AUTO PILOT DISCONNECT AND DFCS LOGGED FAULTS. PER FIM 22-11 TASK 854. REPLACED STABILIZER TRIM MOTOR M1659. RMVD AND INSTALLED NEW M1669. REF B737-900 AMM 27-41-71/401.