Bill Thalmann is reputable, in Virginia and is probably very busy. He did a whole raft of work for me- an old tube preamp, a pair of ancient tube amps, restored a period Technics SP-10 etc. He was the Tech Director at Conrad Johnson. His shop is called Music Technology. I visited to drop off my equipment, en route from NY to Texas. Lots of stuff, in an industrial warehouse setting, including tons of keyboard instruments-- those are not easy to work on.
He's good, he may take some time, he's not a rip off.