Aria SB-JR750 Electonics Problem

[willb41]

Hello everyone. I have this awesome Japan Aria Bass but it is not working correctly. I have been able to touch a 1/4” plugged into an amp onto the first potentiometer and get a dry signal. I can even touch the cable to parts of the pre-amp and get a dry signal, but not where the wire comes out and goes to the jack. In fact have tested the jack and it works well. Can anyone advise if they see anything wrong on this board or what to test?

Does anyone have a schematic?

Thank you so much!