Hi Peter,
Whitley Bay Organ centre are advertising some 'Upgrade Boards' for Technics keyboards. http://www.whitleybayorgans.co.uk/prod03.htm
Send them an email - you may be lucky....
Scroll to the bottom of the page - the boards are the last item in the list. The contact email is printed at the bottom of the page.

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Willum
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Willum

After silence, that which comes nearest to expressing the inexpressible is Music.
Aldous Huxley
( especially when the music is played on a KN7000....)