Z2 Screen Discolouration

I've had my Sony Xperia Z2 for coming on 3 months now and yesterday i noticed a slight yellowy discolouration next to the power button on the screen (see picture below).
This is most visible when the screen has something white on it but is evident all the time (obviously only when the screen is on, no visible damage when the screen or phone is off).
I have no idea why this has suddenly happened and know i havent done anything to the phone that would cause this.
From using google i can find references to the Xperia S having screen issues with a yellowish tint but that seems to be affecting the whole phone and not just one section like mine.
Has anyone experienced any issues like this?
How do I stand with Sony getting a replacement/screen fix as the phone is less than three months old and (in the UK) still covered by the 1 year garuntee on the product as i have only used the phone in the manor it was intended to be used.

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
I suggest that you visit nearest service center to have your phone examined by a technician. You can contact your local support team for further information about nearest service center and/or how to proceed with this in the best possible way:
http://www.sonymobile.com/global-en/support/contact-us/contact-info/
- Official Sony Xperia Support Staff
If you're new to our forums make sure that you have read our Discussion guidelines.
If you want to get in touch with the local support team for your country please visit our contact page.

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I removed the upper plate holding the keyboard and the interior of the machine was very clean with only some small dust accumulations in the fans, which were removed. There was no sign of any discolouration, corrosion, or other unpleasantness on the PCBs. All connectors and wiring looked good.
Every part of the logic board, cables and connectors were percussed, gently deflected and spray freezed, both while the fault was present and not (machine running) with no effect.
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Thanks,
Joel.

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