I think in most cases that it comes down to replacing the electronics. I don't know if the SLRs have a type of input port like most cars today that lets the tech plug it in and diagnose. Models are replaced so quickly that it probably makes more sense to do a quick diagnosis and then replace chips/circuity boards. I wouldn't think it would be cost effective for a third-party repairman to try to have diagnostic equipment for each of the camera makers unless it is a big operation.
Yes, you are right Mike.
The EP-2 is worth the repair.