As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE THE B AUTOPILOT DISENGAGED IN LEVEL CRUISE FLIGHT. AIRCRAFT IS IN TRIM WITH NO PRESSURE BEING APPLIED TO THE CONTROLS. REENGAGED AND DISENGAGED ONE HOUR LATER WITH THE SAME PARAMETERS. ACFT GROUNDED. REPLACED MODE CONTROL PANEL IAW AMM 22-11-34-000-801, AND 22-11-34-400-801. PERFORMED BITE TEST GROUP 32, NO DEFECTS NOTED. PERFORMED LAND VERIFY TEST BITE TEST GROUP 49, NO DEFECTS NOTED. INSTALLATION TESTED IAW AMM 22-11-34-740-801, NO DEFECTS NOTED. AIRCRAFT CAT III AUTOLAND AND HGS QUALIFIED.