Thank you very much for your help! I did notice the rollers and adjusting screws but thought it looked like some sort of thread lock (Green Goo) was used on them so decided to not disassemble the modules more to adjust them. If your telling me that by adjusting these rollers it will take the left/right play (see-saw) im having thats great news and im sure this post will help many others. By any chance do you have any photos of the bracket assembly and adjusting procedure?
On a side note, whilst regreasing the X-axis module I noticed both rollers were showing signs of rust. None of the other modules rollers had this issue.
Thanks