Stiches Slow and only goes straight

Question

I believe that my 9000's circuit board is friend because the machine will only stitch straight and stitches really slow. Also, when you hit the up down button it won't stop stitching. If anyone knows another reason it would do this please let me know. Otherwise, where would I be able to get a new circuit board or find another broken one that I could get the board out of.Thanks,Liz