If he/you knows which transistor is the dead one, take it to someone who works with electronics and have them fix it. I'm into that kind of stuff, so if it were me, I would troubleshoot and fix the board myself.
Repairing electronics is really becoming a lost art. With electronics becoming cheaper and labor becoming more expensive, people throw items away when they break instead of fixing them. I remember when RadioShack was filled floor-to-ceiling with repair parts. Now they are nothing but a cellphone store with a tiny case of repair parts in the back. Most of the people who work there don't even know anything about electronics. If you say you are looking for ******, you get a blank stare and they ask you if you want a new phone.
I would say that most people probably just replace the whole board because they don't know how to fix it. It would be worth a Google search to see if someone has pulled something together for troubleshhoting/repairing that board. Like most things, there are probably just a couple parts that are the weak link on the board. Fix those, and you'll be in business.