right softkey light leaking to the screen trough :(

For some reason the softkey light of the right button is leaking to the screen.
When i lowered my screen brightnes ive noticed there is a light shining from the right softkey in to the screen. Its leaking trough a tiny hole between the glass and the amoled screen. I guess its an adhesive failure.
My questions
1. Can i fix this my self?
2. How is this even possible when ive newer opened the device?
3. could i fix it by pressing on that place and maybe also heating it slightly the same time?
4. is it possible that also dust will enter trough that hole?
5. would oneplus take care of that?

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