Does anyone have spare parts for S2?

I had bought a S2 from craiglist, but discovered that the left jog wheel does not track. I've tried switching the wheels and it's still the left one that doesn't work, I'm hoping it's the little board that is under the wheel.

I know this is a long shot, but does anyone know where I can purchase the part? If you have a broken S2 that has that working part, I would love to buy that part off of you.

Thanks!