Maintaining these once great cameras have become a major pain for me. I have two F2's that are unusable and I may sell off for parts. I have one F3 that went in for a shutter bounce repair and came back with the same problem. Nikon doesn't even want to touch a F2 and the F3 they will look at but they told me that finding parts if needed may be time consuming. Good luck with your search and let us know if you find someone reliable.
google Sover Wong for the F2's, his work is top notch and he warrantees all of his work