NSM Century 21 E

Hi There

I'm new to this forum, I am working on a NSM Century21 E Jukebox, I have got it working and playing etc,

Except for four buttons on the selector, numbers 5,6,7 and 8 do not work.

I have test the buttons and they produce a short when pressed, I have tested the cable, thats ok.

So now I am at the control and credit board.

Does any one have any ideas or tips? Does anyone have a schematic for this board (103 760)

Thanks in advance for any help.

"Keep On A Rockin"