I had a stress crack on my Solstice, called the dealer and was blown off. I searched to Kappa forums and found a few others that had similar issue, called the dealer back and was told "everything I read on the Internet is not true"
Anyway, I asked for a manager. He was skeptical and treated me like an idiot, but asked me to take it in to look at it. As soon as he saw it (and it looked like the one in this thread) he immediately said it would be covered and was very helpful, etc.
A LOT of people out there are clueless and would expect warranty to cover cracks from rocks, etc. so I can see a dealer wanting to take a look, but not being rude from the start would help...