Thanks for the thoughts.
I have tried the self-calibration lock-to-lock several times but to no avail.
The NT510 has a specific calibration function in its software.
The code I am getting says "SAS needs calibration."
However, on my Creator 310 scanner I can look at live data and can see the angle of the steering wheel and can see it at 0° when dead straight ahead and then it changes correctly depending on the steering wheel movement.
So, it would appear the SAS is outputting good data but the main brain is not seeing it.
Mike