As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCI - FLT 139 - AT CRUISE, CAPTAINS ATTITUDE IN PITCH BEGAN JUMPING 2 TO 3 DEGREES. SELECTED ATTITUDE TRANSFER SWITCH TO 'BOTH ON 2' WITH NO HELP. FLIGHT DIVERTED TO MCI WITH NO FURTHER INCIDENT. MAINTENANCE REPLACED THE CAPTAINS ATTITUDE DIRECTOR INDICATOR. PERFORMED OPS CHECK OF ADI PER MM. OPS CHECK GOOD. (M)