aliikane

This is for Kilndoc, I have a CI HP. It will only run at full speed. I was unable to control speed with the pedal. I tested the pot in the pedal and found it bad. I replaced the motor bearings as they were noisy I Just replaced the pot in the foot pedal and still am not getting speed control. Wondering if there is a problem with the board, who made the board or who might have a schematic for the control board or can do board repair on this board. Would you be able to point me somewhere?