As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE THE AIRPLANE OCCASIONALLY TURNS RIGHT AND WILL NOT RESPOND BACK TO THE LEFT WITH FULL AUTOPILOT HEADING DEFLECTION TO THE LEFT. FLIGHT CONTINUED AND AN UNEVENTFUL LANDING WAS MADE. REMOVED AND REPLACED THE AUTO PILOT ROLL CHANNEL COMPUTER. SYSTEM OPS CHECKS ON GROUND OK. AIRCRAFT RETURNED TO SERVICE. (M)