As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SECOND AUTOPILOT DISENGAGED DURING PRACTICE AUTOLAND PRIOR TO 1500 AGL OTHER AUTOPILOT WAS DISENGAGED MANUALLY AND HAND FLOWN TO LANDING, NO OTHER DEFECTS NOTED. ACFT GROUNDED. ACCOMPLISHED CURRENT STATUS TEST FOR CHANNEL B REF MM 22-11-00, ALL TESTS PASSED.