Where can I get repair work done on a cummins ohan commerical generator?

Up in Solano myself, but I do have 2 very smelly ratty looking Shittsu's, and know a thing or 2 about the Onan's. or at least enough to know you should have bought a Honda, however theres plenty of authorised Onan repair centers down in your area, google is a wonderfull tool.