As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNSUCCESSFUL HGS AUTOLAND. SECOND AUTO PILOT WAS ENGAGED COMPLETED SELF CHECK THEN DROPPED AUTOPILOT A. GROUNDED - YES. ACCOMPLISHED DFCS BITE WITH NO CURRENT FAULTS OR FAULT HISTORY. RAN LAND VERIFY TEST, BITE GROUP 49, TEST PASS. ACCOMPLISHED ALL REQUIRED LLM TEST FOR MEL 22-99C, ALL TEST PASS. REF B737-900 AMM 22-11-00,22-00-01, 22-11-33. GROUND VERIFICATION SATISFACTORY.