@facten -- My thoughts, also. Unless you are getting the steal deal of a lifetime, why would you buy an amp that's still under warranty (implying it's not that old) YET NEEDS service work already? In the automotive world that's usually called a "lemon".
Warranty repair wait times - serious industry problem??
I'm looking at buying a used amplifier that needs some work, and lucky it's still under warranty. In researching places to get work done it's horrifying to learn that it could take two or three months after speaking to a few places.
Is this a widespread problem in the audio gear repair world? That's really bad.