PSA if your handset has a distinct creaky left side it may be sorted easily.
The following worked perfect for me. Created an account just so I could share it with you guys. Enjoy!
"I'm assuming the way into the device is by pulling the side and then the back off, probably why it's a little flimsy. Anyway my left side was really creaky, I kind of put my nail in beside the keyboard, pulled it out up to power button, lifted forwards a little and then pushed in with a little force and now much better, no creak. I guess there are some little tabs and sockets in there that may have popped out. Once I see a repair guide this will either prove or disprove, however what I did worked."
Source is from blackberry reddit, but since I don't have 10 posts yet I cant post the link.