As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH WITH THE GOAL TO FLY AN AUTOLAND BOTH A/P WERE SELECTED AND A/T DISENGAGED UPON INTERCEPTING LOCALIZER. WE TRIED RE-ENGAGING A/T TO NO AVAIL. CHANGED TO HGS A3 APPROACH AND DISCONNECTED A/P, HGS SUCCESSFUL. GROUNDED - YES. ACCOMPLISHED B737-800 FIM 22-31/802 FOR MX MESSAGE 22-31543, LOGGED IN INFLIGHT FAULTS. CURRENT STATUS AND INTERACTIVE TESTS PASS. GROUND VERIFICATION SUCCESSFUL.