IBM model M right shift key problem

[ccfd]

I recently bought a model M 1391401, and I bolt modded it.

Well....
My 'x' key does not work with right shift key.
The left shift key works fine so that I can print uppercase x "X".
But I can't do this with my right shift key
The right shift key works fine with other keys.

Anyone knows why this is happening and what is the solution to this?

[mapple]

only way which I could imagine is either replace controller or if you can't try to contact unicomp they might be able to help you out.