As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE, AUTOPILOT A DISENGAGED TWICE AT FL340, IN SMOOTH AIR, NO CONTROL FORCE NOTED. AUTOPILOT RE-ENGAGED WITH NO DIFFICULTY EACH TIME. ACFT GROUNDED. DFCS BITE MESSAGE 22-11607 FOR PREVIOUS FLIGHT ON CHANNEL A ONLY. ACCOMPLISHED FIM 22-11 TASK 817. MCP FOR BOTH CHANNELS PASSED.