Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

Hello-
I've been handed another battery-damaged Polysix to repair; what's
different about this one is that it contains a MIDI board that appears to
be from Korg --
it's labelled "KORG USA" "Polysix MIDI Retrofit".
I haven't come across this particular board before; does anyone have any
idea where to find documentation for it?
Thanks.

~GMM