As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT THEY EXPERIENCED AN INTERMITTENT FLIGHT CONTOLLER CHANNEL B FAILURE DURING CRUISE FLIGHT. THE FLIGHT CONTROLLER WAS FOUND TO BE DEFECTIVE. REMOVED THE DEFECTIVE CONTROLLER SN 1112. INSTALLED A MODIFIED UNIT. FUNCTIONAL CHECKS WERE SATISFACTORY. REF AMM 22-10-05.