What was found
IN CRUISE FLIGHT WITH NR 1 AUTOPILOT ENGAGED THE AIRCRAFT EXPERIENCED AN UNCOMMANDED RIGHT HAND DESCENDING TURN. VERTICAL GYRO REPLACED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
IN CRUISE FLIGHT WITH NR 1 AUTOPILOT ENGAGED THE AIRCRAFT EXPERIENCED AN UNCOMMANDED RIGHT HAND DESCENDING TURN. VERTICAL GYRO REPLACED.