Vintage Synth Repair

I initially was just doing my repair on the left panel ribbons which
went successfully though much worse than usual.  The right panel had
worked perfect always.  But after finishing..I discovered that the
thing has a quacking sound when keys are hit occasionally *and* that
there is a single voice that always is different...but it doesn't
follow the analog channel.  Anyway not to elaborate on that mess....

It got worse.  Suddenly..none of the right panel switches work.  I'm
not kidding.  This is absolutely bizarre.  I tested them. No contact.
 I short across and can actuate the functions that correlate to the
switch I'm trying to test for continuity.  There is no reading on my
diode checker and they don't work.  They are all open. There is no
disconnection in EITHER cABLE all the way down to the main body of the
plastic.  Has anyone..ever seen anything like this?  (I know..I'm the
only one on earth who's ever seen this..again.  right? I mean it
doesn't even seem possible.  That that many switches
just..simultaneously corroded.  Man..my breath must be HORRIBLE! 
Seriously... does anyone have any right panels left?  The left usually
fails so I'll bet someone has a glut of them somewhere.  -Bob