As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN AUTOPILOT IS ENGAGED ON CAPTAINS SIDE, THE YOKE AND AIRCRAFT OSCILLATE ON ROLL AXIS CONTINUOUSLY. YOKE ROLLS ABOUT 2 INCHES TRAVEL. REMOVED AND REPLACED NR 1 AHC85 PER MM 34-21-01. OPS CHECK GOOD PER MM 34-21-00. AUTOPILOT OPS CHECK GOOD PER MM 22-10-00. P/N: 622-6190-204, S/N ON: 2268, S/N OFF: 2125. (REFERENCE TRANS 659949 FOR TROUBLESHOOTING).