Guy's 337G attitude indicator A/P problem

[Guy Paris]

Hi All,
Just recently when I cranked up my flying machine the attitude indicator
went full up and stayed there for about 10 t0 15 minutes and then settled
down. I then took a short flight. When I went to engage the A/P, it's a Cessna
400A it would not engage. I believe the A/P works in conjunction with the
attitude indicator. Anyone have any thoughts?
Guy Paris....