As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT ON APPROACHING 2600' IN FLCH AT APPROXIMATELY 210 KIAS AIRCRAFT ABRUPTLY PITCHED NOSE DOWN MISSING ALT CAPTURE BY ROUGHLY 200' REQUIRING A/P DISENGAGEMENT TO CORRECT AIRCRAFT. A/P CENTER WAS IN USE. NO PREVIOUS HISTORY. PERFORMED CFDS CURRENT FAULTS TEST 30 WITH NO PRESENT FAULTS NOTED. RAN SUCESSFUL CFDS AUTOLAND TEST 40 IAW AMM 22-00-02-2-1. ACFT OK FOR SERVICE.