I'm a little late replying, but if you're in VA, I highly recommend Big Crunch amp repair in Baltimore. The owner, Brooks Harlan, has rehabbed several vintage Model T's for me, and he currently has my Sorado and Sonaro.
The guys in Clutch, Scott "Wino" Weinrich, and many other Sunn users trust him with their gear, and that's enough of an endorsement for me.