As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT B FAILED ENROUTE TWICE. SWITCHED TO AUTOPILOT A. QRH 4.2 COMPLETE. GROUNDED - YES. DFCS FAULT REVIEW SHOWED MULTIPLE INSTANCES OF FAULTS 22-11607 "MCP DATA INVALID" AND 22-11627 "MCP BUS INV TO FGN FCC" IN CHANNEL B FAULT HISTORY. REMOVED AND REPLACED DFCS MODE CONTROL PANEL PER B737-800 AMM 22-11-34-000-801 / AMM 22-11-34-400-801.