Chosen Solution
have you taken the cover off and had a look?
While your system does have some moving parts… I have never heard anyone use the iSight camera as the reason of being loose! Thats just BS! Sorry Are you sure you aren’t confusing the Touch Pads Taptic Engine piston which does float a bit if you shift the system when not powered. Bring the system back to the Apple Store and have the so called Genius encounter the issue on your system then go to one of the systems on display. I bet you won’t encounter it on it on the display unit.
