Selling my iPhone 6, 64gb model. I am the original owner.
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The screen, battery, and button have been replaced (a couple years ago).
You can see there is a small section where the new screen isn't fully glued to one corner. It was like that since the replacement and has caused me no trouble.
What has caused me trouble is that the replacement button has recently become responsive only half the time, and should be replaced. When I originally did this, the repair guy charged me $30 for the new button. The one I bought which replaced the original did not have Touch ID capabilities.