As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT WILL NOT RESPOND AND LEVEL OFF DURING FLIGHT. ALT HOLD PORTION OF AUTOPILOT DEFERRED IAW MEL 22-8-2E. PLACARD INSTALLED. WAS UNABLE TO DUPLICATE ON GROUND. REPLACED DADC IAW DHL DC-8 SM 34-11-0 AND 22-10-0. PN OFF AND ON 9B-81010-15, SN OFF 15037, S/N ON 2691.