I contacted my Distro (JJ @ Game Exchange) and let him go to bat with Stern for me. My GB was cracking on the left side. It took a week or so for them to get back to me but they asked for pics of the crated Pin from when I received it (my theory was to prove it wasnt shipping damage). Luckily, when It first arrived I took tons of pics of it crated up on my porch so I could post here that I got it, haha.
Long story short, they agreed it was enough of a problem to warrant a swap.
They were supposed to send me a "mostly populated" cab (brackets, ground braid, buttons, speaker, etc, all there, only to have to swap the coin door, node board, head and PF) but what I got instead was a completely bare lower cab (where I would have had to move EVERYTHING). They agreed it was a mistake.
I politely made my case that this was unacceptable and they agreed and 100% made it right, they had a local stern authorized repair company come out, pick up my game, do the swap for me and bring it back. (the company even put on the beefier Williams/Bally style leg brackets for me)
Very happy how it turned out in the end.
I assume this will not be everyone's experience, so YMMV.