As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT SLOW TO LEVEL OFF FROM CLIMB AND DESCENTS. WHEN SELECTED DESCENT ON AUTOPILOT, AUTOPILOT INITIAL CLIMBS IN LEVEL FLIGHT AUTOPILOT SLOWLY CLIMBS AND THEN IS SLOW TO LEVEL OFF. REPLACED PITCH CHANNEL COMPUTER. OPS CHECK GOOD IAW DC-8 MM 22-13-1.