Found this thread on MOA Forum from 2020. Don't know anything about him or if he's good with airheads.
"I have used a really good and local motorcycle mech North of Pgh for 5 years or so. I find him very reliable, thorough, knowledgeable, honest and super fair in pricing. He’s not a BMW specialist and works on all brands, but he has never let me down. Andy Doe, by appointment only. 7248146023. I usually text him for appt. His contact info was given with his permission. In the country near Cranberry. 275 Glen Eden Rd, 15074"
I saw a post maybe on the MOA FB page or somewhere in the last couple months of a guy working on old BMWs in Pgh. I'll dig around and see if I can find anything again.