Hi,

I recently acquired a 707, but there's a small problem with it i'd like to repair.
There's 3 of the "step/instrument' buttons (steps 1,2, & 5, or both bass drums and low tom) that are not working any more. Except for this, everything works fine so i'm pretty sure the problem is situated on the switch board...
I opened it up and the switches on the board of those buttons seem a bit burnt. the rest looks fine, no bad soldering contacts etc...
Is there anyone who knows how to fix this or is there no other way than to find another switch board

Thanks!