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Intermittent left keypad button

My problem is the left mouse (keypad) button, it drives me mad. More specifically, it does not always register being pressed if pressed on the left side of the button.
I was hoping to download a service manual to see how to dismantly it and clean behind.
However, I can't seem to find my Sony vao VGN-NR11Z model on the FixYa site.

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