Actually, swapping boards is often the quickest way of pinning down the fault! The question is then what happens
after the faulty board has been identified. That is, does it get repaired in-house?
Answer ... no it usually doesn't! Why? Lack of time, and too many other pressing demands, most likely.
But (as I have already said), some of us are no longer constrained by such matters as serving the customers, but are untethered enough to be able to concentrate on actually fixing (old, usually) kit!
