Stec 50ap tracking 10 degrees right of hdg bug

[Coopere]

Wondering if anyone in the group has come across this before, I have an stec 50 with alt hold and gpss roll steering in the Aztec, went for a flight yesterday and now it seems my autopilot is tracking 8-10 degrees right of the heading bug it does this on all headings all the way around the compass rose... it was normal last time I flew it... dg due for overhaul?

It works normally on all other modes, gpss, Nav ect it’s a pretty simple autopilot, rate based off the tc so I assume it must be the dg...

So basically if I am heading 090 bug 180 the aircraft turns right but rolls thru the bug and levels out on a heading of 190 with the bug set on 180... seems like a compass card miss match or something

Anyone have any thoughts?
Thanks

 

[Canuck]

 

[Coopere]

 

[kshaw]

 

[Canuck]

 

[Dravnx]

 

[kshaw]

 

[Canuck]

 

[force5]

 

[clinect]