Stern has the ability to return boards to CSC (the company who builds the board for them) to test and repair the board. They don't do really complicated repair work in house. And honestly, I doubt their distributors do either.
I've discussed this with the guys in service a bit, as I've had to call them with a few things after I started doing whitestar repair. I had a Monopoly CPU with a massive failure that I was just about ready to bounce off the wall. The customer connected the display connector to the speaker out, and blew a few traces right off the board!
Call in and talk to Chaz or Pat.
You can check with Rob and Chris as well, they are both excellent technicians. And sending the board to Stern won't exactly be cheap.