EKSC supplied a schematic with his DIY cap replacement kit. I am hoping some here may have those schematics on file and can present a PDF.
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They can be tricky to fix! I repaired one about 25 years ago (but after the designer disappeared) and even then schematics were almost impossible.
You're simply going to have to test every semiconductor in the amp (and if need be, out of circuit) including diodes. Then you're going to have to find suitable replacements. That in itself is tricky, as you can't just go to ebay since there are so many Chinese counterfeits that won't meet spec. IMO that is your biggest challenge- much more so than finding a schematic!