crwdns2934241:0crwdne2934241:0 Tom Chai

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There are foam cushions inside the camera slot on the back cover to prevent dust ingression.

https://guide-images.cdn.ifixit.com/igi/KSKFj6YZHGMywjN2.full

Check if that cushion is broken or the camera placement or the case alignment caused the cushion to not sit right, allowing dust to enter.

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