iphone 4 yellow tinted screen

i have iphone 4 32gb for like i think 3 months now and yesterday when i compare my phone to my sister iphone 4 16gb i noticed that her iphone is brighter then mine and is whiter. My iphone have like a warm yellow when i compared it and the brightness was maxed out on both iphone. So do you think apple gonna replace a new iphone for me and do u have to bring all the original box and stuff with you when u take it to the apple store? oh and my iphone have like light leak in the upper right corner like a small straight line