Korg Poly800/EX800 Users

Hi, Everyone ---

A recent posting reminded me of a question I've been meaning to ask.
A few of the keys on my Poly-800 Mark I have some surface damage.
I think a previous owner tried to clean them with something caustic.
I was wondering whether there was a source for replacement keys.
I suppose one solution would be to find a dead machine and cannibalize
it, but I figured there might be a less destructive solution.

Thanks,

--Dave--