I am posting this information for anyone who is looking for the service manual/schematic for this preamp. I've looked everywhere for the schematic and the best match that I can find is the GP12 X Series 6 Preamp. All the vaules appear to be correct except the value of R78, which is 100 Ohm on my board and there is no tube circuit.
GP12X Series 6 Preamp Schematic
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