Coda FET-02b Preamp Schematic

Having purchased a used Coda FET-02b (without owner's manual), I'm considering some upgrades but want to look at a schematic before jumping blindly in. Anyone out there have an original manual for the FET-02b that contains a schematic? I'm willing to pay for a copy to make it worth someone's trouble.

I checked the Coda website and the online manual doesn't contain a schematic and folks at Coda aren't interested in handing out copies.

Thanks,

Jon