I've used Al Forbes, Alpha Sound in Charlotte, NC. He's the greatest. I've known him since the late 70's, and he's never let me down. A good friend and fellow Sunn nut uses Steve Stoeckle, also in Charlotte- I've known Steve a long time and he is one of the best techs I've ever used as well. My buddy takes the tube stuff to Al, and transistor to Steve, I take the old stuff to Al and the newer stuff to Steve. Both guys are great and a Coliseum Al worked on 6-7 years is still kicking butt.
I have some 75V 6900 mf caps, exact same size as what is in a Coliseum if anyone needs some. Phillips, I redid both my Coliseums and made a huge difference.