Montage M pot wiggles

HI so one of the 8 pots below the left screen


wiggles slightly but works fine. Is this a nut that can be tightened or do I need to resolder it?

I think if there is a nut, I have to open up the board to do so.

You have to open it up to check. Most likely it’s just like you said,”either the nut needs tightening or solder joint came loose. You’re on the correct path to fixing it, especially since it’s still working for sure