Left and right side of the screen creak when you press in slightly.
Mine has done this on the left side since I got it in August. It's never really bothered me much but last night I decided to try the one trick that always seems to work and sure enough, instant results.
The back of the 7 pops off really easy, much like a phone backing would on a Galaxy Nexus for instance. The battery is made to be user replaceable after all.
So taking my fingernail on the corner I basically just popped the entire back off, located all the peripheral screws on the surrounding frame and lightly tightened them up a bit with a small phillips head screwdriver. Then I took the back and simply snapped it back on. Took seconds.
And presto...no more creaking. Worked like a champ. Give it a shot and see if that solves it for you, although YMMV.