Kurzweil MP10 Volume and Pedal Malfunctioning

I’m looking for a repair manual for a Kurzweil MP10 Keyboard. The volume control does not work and the keyboard sound is stuck at it’s highest level even when the volume is turned off. The pedals on the keyboard are no longer working as well. I’ve checked the wire connections, but I cannot access the volume control area without taking the bottom panel off. I would like some advice or a manual on how to proceed. Thank you.