Vintage Synth Repair

So, I got it powered up. I've got a group of 5 adjacent dead keys in the middle of the keyboard. No obvious sign of beer ingress - the electronics looks like the keys are grouped in fours.

Any ideas?

--- In vintagesynthrepair@yahoogroups.com, "tedwood@..." <tedwood@...> wrote:
>
> 
> So, I got it powered up. I've got a group of 5 adjacent dead keys in the middle of the keyboard. No obvious sign of beer ingress - the electronics looks like the keys are grouped in fours.
> 
> Any ideas?
>

Hmm. I reseated all the keyboard connectors and it went away. Now its come back again. Any suggestions (or better still a schematic...)