Hey, So after using my retina for a few days I've noticed that when you grab the machine on the left or right sides near the air vents the back case makes a cracking/clicking sound if you apply normal pressure. It happens 95% of the time and on both sides. I believe this may be due to loose pentalobe screws on either side. Is anyone else experiencing this issue? Do you think radio shack will have pentalobe screw drivers on hand to just use for a few seconds to maybe try and fix?