Need recommendation for repair service in CA bay area - McCormack DNA-1

FWIW, I've been investigating the McCormack lines looking for an amp for another system. I suggest you do some research as well. There have been considerable conversations about failures of an input board in the DNA .05 and DNA 1 model amps. I don't know if this could be your problem but if it is you may not want to pursue repairs. One of the posts in a thread is from McCormack describing the problem and why it is in their opinion not 'repairable', at least why they will no longer do so anyway.

Good luck............

If a manufacture tells you, your amp is not repairable, DON'T BUY THEIR PRODUCT'S !!!!! Because I won't. 

@newbee is correct.  No brainer give SMcAudio a call — they designed/built your amp and will be by far your best resource, and lucky you at least they’re in California (I had to ship them my amp from NJ 😖).  The input board on my DNA 0.5 RevA failed, which makes the amp not repairable so I decided to send it to them to do their full upgrade mods, which basically makes it a new amp with all their latest/best parts and thinking.  The only parts they kept from my amp was the case and the transformer only because it was already upgraded in the previous RevA mod otherwise that would’ve gone too.  Hope this helps, and best of luck. 

Give Scott Frankland Associates a call. They are in San Jose. Scott is a very competent engineer and does repairs on both solid state and tube equipment.