Just for reference,
Last December my G5 2.7 started to leak. I called Apple, they offered free on site repair, but I lived outside of the repair radius. So I drove it into the Apple Store, they took it back, said they'd diagnose it, repair it, and call when it was done. They called back about a week later, saying the repair didn't do the trick, so they'd replace it with a new 'like' machine. A few weeks later, I had a 8-core 2.93 Mac Pro sitting on my desk! Sweet!