Did you ever contact anyone to repair it? In the US you can try Stu at Eutronix (link at the top of the page) for repairs, or contact Rob Schofield who does the official repairs located in Cambridge, UK. Rob does have the schematics, but I'm betting both repair it.
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-Michael

#040103696 on a shelf
Mk2a - 90 GB - Red - Illuminated buttons