Rock-ola 496-1 - The front panel buttons pad does not seem to work, I was able to get it to work once.

I do have manuals, however, she has schematics for the amp, the 55115-1A, she has a System 3 (55130-1A).
Which appears to be working.
If you press Play all, nothing happens, or any other button, it does not register on the Display.
I was able to select 112, and it played once.
So it could be the cable, did remove and clean the fingers on the keybd controller,
or the keybd controller.
Anyone know of any parts, this is a 1988 Rock-Ola 496-1.
Thank you in advance.
Tim