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Sound Workshop Series 40 Schematics mixers with vertical indicator

I address to engineers and technical experts: please, help to find schematics of Series 40 mixers with vertical indicators (what gathered in the USA in 80, from a brand Otari). I have found all schematics - 1280, Series 20, 30&34. But Series 40 schematics is not anywhere! I thank for any help!