I receive an occasional query regarding Apple ][ repair services. I have considered offering repair services, but feel that frequently, problems are traced back to intermittent connections between sockets and chips on these old boards. Apple didn’t use the best sockets in it’s products and once you start having intermittent problems with sockets, they probably aren’t going to stay away for long. Because of this, I feel that it would be very hard to provide a repair service that would consistently return boards that are reliable over the long haul.
Creative Solutions does offer repair services, though I am not sure if they still are in business. You can try contacting Creative Solutions at email@example.com or phone (937) 429-5759 M-F 9-5 Eastern.
I really feel that your best bet is to find a fellow vintage computer hobbyist in your area that would be willing to work with you in troubleshooting your board. Half the fun of these old machines is learning how to fix them up and get them back into working order.