Just got mine back a couple days ago. I recommend anyone suffering from the purple tint problem send their phone back. Not only did the fix my camera, but they cleaned out the inside of the ports (headphone, power). Mine had black and blue markings from the cables I used but they wouldn't come off too easily, when I got the phone back they were all gone. My camera lens which had watermarks and a very very thin scratch, was clean; seems they put it a new one. The best surprise though was that they made all the edges on the phone tight and flush against the white plastic. Mine no longer has a gap at the top/bottom like most others do.
Long story short, send the phone in, they'll fix your problem and maybe more.