I've used Rick Rupert of Ruberts Music Works and was very happy with his work. He's worked on a couple of my SAE 2600 amps. He's in South Williamsport, PA. His number is (570)323-2911
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For anything Jame Bongiorno designed I would only go to Michael Bettinger if possible.
Mike restored my Sumo 9 and it is one hell of an amp now.
I don't know if you are in the NY metro area but if you are I've had Scott Gramlich of SG Custom Sound do a lot of repairs for me. He is out in Douglaston Queens NY. Near the LIRR.
Here is his info:
40-33 235th Street
Douglaston, NY 11363
Thanks and good luck.