Tube amp repair in Socal?

I'm asking for recommendations on tube amp repair in the southern California area. (Los Angeles) While my Muzishare X7 appears to have impressive build quality, I'd like to have a back up reference in case I ever need some repair work. Lacking someone close, I'll take a recommendation anywhere in the states. If I have to ship it some day, so be it. I didn't know what to expect for $1300 at the time for the X7, but it is amazing. That said, any electrical unit can have a problem that needs attention. 
Thanks in Advance. j