i love my 3GS to death, the thing is stable as a rock. one problem though-theres a very noticeable amount of dust that appeared under my screen one day. should i bother bringing it into the genious bar? will they just take the screen off and wipe it down? im asking bc its a pain to restore and rejailbreak just to bring it in and have nothing really happen. would they swap out my phone for a new one?