[Garryese]

That bites!

3 grand has to be top ends and lower bearings if it's in five boxes. I'm guessing they are saying it was dusted or swamped, both of which leave tell tales signes that any good mechanic can read. I'd suggest taking the parts to any other dealer any let their mechanic look at the parts and tell you what they find without giving them any background info.

Any chance they kept an oil sample?

You'll want to get your poop in a group before talking to the area rep.