MS-20 Kit keyboard CV has gone all wacky!

As I know the CV from the days it worked, which was
C1 1.00V, C2 2.00V, C3 4.00V, and C4 8.00v From earlier notes.
+/- maybe .01 on these but quite close to log CV.

Now I get 1.17, 2.18, 4.19, and 8.20 respectively.
This sounds like hell!!!

It had did this before and I stored it for 6 months and it got better.

But now after months of working I retired it for a month and
now I am getting the settings.

It is like a about .2V offset to all the C notes.

Any idea which bushing hides the CV value adjustment?

puzzled in Sarnia.