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FYI, tech Support at Gallien-Krueger will email any schematic, service bulletin, layout, or parts list requested. Call (209) 234-7300 and ask for tech support, or email support@gallien.com I found them to be most helpful, easily on par with Peavey and Kustom.
Complete service manual for all revisions through preamp board 206-0251-A3 and power amp board 206-0250-A4 can be downloaded for free here:
https://elektrotanya.com/gallien-kru.../download.html
Includes service bulletins.
Complete layout, schematics, and parts lists for preamp board 206-0251-B1 and power amp board 206-0250-B are attached below
Complete service manual for all revisions through preamp board 206-0251-A3 and power amp board 206-0250-A4 can be downloaded for free here:
https://elektrotanya.com/gallien-kru.../download.html
Includes service bulletins.
Complete layout, schematics, and parts lists for preamp board 206-0251-B1 and power amp board 206-0250-B are attached below