Well, I brought mine in for 2 issues: My iPhone keeps crapping out: It will run sluggish, then it will get stuck on the screen. You soft-reset it, and all you'll get is the apple logo on the main screen until the battery craps out. The only fix is a full system restore through itunes.
That was my main complaint. I also have the cracks along the headphone jack and vibrate switch.
He plugged my phone in, and said there were no logs, because I did a full restore through iTunes last night (which I had to do: I need to use some reference software for work, and it wasn't working for me!). So he said come back if it does it again, and they'll investigate the logs.
I asked about the cracking: It's just superficial. I wouldn't be too concerned.

You guys made it seem like it's a simple swap: Tell them it's cracking, and they'll instantly swap it out. I go in for 2 problems, and he sends me home packing.
Do I need to push more or something??? Phone is new as of January (Birthday gift), and has never been dropped. She has her own dedicated pocket, and is protected by an invisible shield (i took it off for her checkup today).