As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DEPARTURE IN CLIMB MASTER WARNING (ILLUMINATED) AND A/P DISENGAGED. RESET ELEVATOR TRIM AND WHEN ENGAGED YAW (DAMPENER) THE PLANE WENT INTO A DIVE TO THE LEFT. DISENGAGED AND CHANGED (AC) INVERTER, HIT YAW DAMPENER AND AGAIN DIVE TO THE LEFT. AIRCRAFT WAS HAND FLOWN FOR THE REST OF THE LEG.