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Hi @Crazy_nutter,
Welcome to the community.
If you repair the screen yourself, your warranty will be void. So even if you do manage to get a working official Sony Xperia screen, when you send it to your local repair team for assessment, you will be charged for the repair on your camera anyway. As uliwooly said, it does not sound like there is actually an issue with your camera.
I recommend you contact your local support team and have them repair your device, as you will likely end up paying more in the long run doing self repairs, re-repairs etc than you would if you just got it repaired officially.
I still think you should have your local support look at it, they can do the whole thing at once, screen, heating etc.