Best way to fix yellowing on part of screen topic

So I've noticed yellowing in the upper left hand corner of my N6...it's fairly faint, but it's certainly noticeable...what's the best way to go about fixing this? Do I have to change RGB settings through a custom kernel, or what's the easiest way? Thank you.

Need a part from a broken phone topic

Does anyone have a broken Moto X that they are parting out? I'm trying to find a piece that can't seemingly be found anywhere else. The part that I'm looking for is a small rubber grommet that goes around the proximity sensor between the motherboard and screen, shown in the picture.

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