Yellow Issue Fix

Really? I was under the impression that the yellowing followed a gradient, and that changing the color profile to suit the yellowed area would dramatically tint the rest of the screen.

 

People get confused between an overall yellow tint to the screens (because Apple supply by default a yellow-ish colour profile), and screens that exhibit uneven yellowing in the lower third of the screen.

The first can be almost completely changed/fixed by altering your colour profile, or calibrating your screen. Their are plenty of threads here where you can download colour profiles other people have created.

The second issue is a hardware issue, and can only be "fixed" or improved by sending your machine in to Apple to have the screen replaced.