Today I discovered that my iPhone 5s is coming apart on its own. The front screen is intact, but has lifted by about 1 centimeter at the top left of the device. The screen backlight is separated from the glass in that area. The device wasn't plugged in or near any heat source, and showed the depleted battery icon when I tried to turn it on. This is no longer my primary phone; I bought an iPhone 6 a few months ago.
I bought the 5s new in October 2013 without AppleCare, so the one-year warranty has lapsed. The metal band around the edge of the phone has scuffs and dings. I certainly can't prove it, but that damage happened months before the screen separation. What I suspect is happening inside the device is that the battery has altered its shape and forced the screen to detach. Or perhaps an adhesive has deteriorated.
If I take this phone to a genius at an Apple Store, what will happen? Will Apple take responsibility for a manufacturing defect even though the phone is out of warranty? From Apple's support website, I see that the standard out-of-warranty cost for a 5s is US$269. It's possible I purchased this phone with a credit card that offers automatic warranty extension; I can look into that.
The phone turns on and works. I no longer need this device, but I'd like to recover some value from it.