Vintage Synth Repair

Does anyone know of any good resources (aside from the obvious, going 
directly to the company, etc.) for information (general info, schematics, 
information about options, different versions and compatible models, 
possibly parts...) regarding the Wersi MK1 (and associated EX/DX models)?  I 
just got one but the manuals are in German (which I can't read).

Thanks.

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