Pan Tilt Positions StudioColor 575

Hello,
I have one Studio Color 575 series that will not home correctly, the pan and tilt appear to be appx 15 deg off, even when homing.

I replaced the sensors in the tilt with good ones from a StudioSpot there was no difference.

I compared positions of the pulley's, sensor cutouts, head positions...... with a StudioSpot and all looked good.

I then tried swapping the logic board with the StudioSpot, the results were that the SS was able to pwr up and work correctly with the board from the SC.

When I tried the board from the SS in the SC the SC would not pwr correctly, I got an err "cannot read....."
Any way, because the board from the SC pwrd up the SS with no prob. I assume that the logic board is good. Iam hoping that there is a way to re-cal the pan tilt positions.
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