As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT ELEVATOR CONTROL JERKS ON CLIMBOUT AND LEVEL FLIGHT. AUTOPILOT ELEVATOR SERVO INDICATOR SHOWS CORRESPONDING MOVEMENT. REMOVED AND REPLACED ELEVATOR SERVO DRIVE IAW DHL DC-8 MM 22-10-4. OPS CK GOOD IAW MM 22-10-4. RII SERVO DRIVE INSTALLATION.