Question Why do I get black marks on my MacBook Pro top case?

unplanned bacon

Honorable
Jan 11, 2014
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I know it's the plastic thing that goes round the screen causing it and the the pop sound/minor movement when you push on it, but what I want to know is why? Pre-repair, that didn't happen, post-repair it did. It was repaired almost a year ago and I needed a computer for my degree so I couldn't be going up and down trying to get something like that looked at since the bigger problem was fixed and it was a working machine again
 

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