I noticed an odd issue with my rMBP. I'm not sure if this has been gradual or not, but I just noticed it yesterday. The top middle of the keyboard, right under the screen at the function keys, seems to have bulged/swelled/dented upward just ever so slightly. It's minor enough that I may not have noticed, but it's made a small indent on the rubber/plastic part of the screen bezel pushing it down a bit. There's also a very slight give when I close the MacBook. It catches when it's just about closed. It closes completely, but requires slightly more pressure to close the last quarter inch or so. All of this is extremely minor (it wouldn't show up in a photo), but I'm worried it's leading to a bigger problem. I imagine if the battery was swelling it'd be evident on the bottom of the keyboard/trackpad, right? The battery health is showing as good. I also haven't dropped or bumped the MacBook and if I had, I can't imagine just the top of the keyboard would push up that way. Any thoughts or has anyone seen something similar?