Spectral DMC-12 - need adjustment info

I recently did some minor repairs to a fine condition Spectral DMC-12, but have been unable to find a service manual, schematic, or even a user manual.

There are trim pots for gain, and others which are for bias of the output MOSFETs, I assume. There are also dip switches for all of the inputs except the phono section, which appears to have solder pads for loading resistors.

Does anyone have a schematic or manual for the DMC-12, or have knowledge of how to adjust these units?