As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT WOULD NOT ENGAGE IN CRUISE. THE FLIGHT DIRECTOR WAS ON MEL & THE LMP STATUS WAS DOWNGRADED. FLIGHT DIVERTED & LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. REPLACED SYS B FLIGHT CONTROL COMPUTER. SYS GND CHECKED NORMAL OPERATION CLOSED.