Touch screen not responise in some areas


My Nook Hd Color 7 inch developed a strange fault. Screen became "dead" in few areas- mainly sides., especially right side.

I have tested it using an app and you can see results here. First photo shows horizontal slides, and second one shows vertical. You can see the gaps,

I have cleaned the screen on the edges and done faxtory reset- didnt help. What can be the problem? Is it worth opening it up ? If yes, what should I look for? Thanks

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