As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT PERFORMED AN INADVERENT ROLL TO THE RIGHT AFTER BEING ENGAGED 5-10 MINUTES. THIS OCCURED MORE THAN ONCE. FD COMMAND BARS ON BOTH SIDES FUNCTIONED NORMALLY THROUGHOUT THESE EVENTS. THIS OCCURED WITHOUT REGARD TO THE POSITION OF THE AP TRANSFER BUTTON. REMOVED AND REPLACED AILERON SERVO IAW MM 27-00-00. OPS CHECK GOOD.PN ON 622-5734-002 SN ON 10433 SN OFF 7728