Can someone do me a favor? I have three pentalobe screws on my brand new Air that just spin and spin like they're stripped. I was trying to tighten them up because I had the "creaking" unibody frame problem that a lot of other people have apparently had. When I found that three of my screws just turn and turn, I was pretty sure this wasn't normal. But the three screws that just spin are all right in a row, so I wasn't sure if that was by design or a coincidental defect. I'm taking it to a genius appointment on Sunday. If these things shouldn't be spinning like this, can I tell him that I found the screws to be spinning without them accusing me of voiding my warranty? Thanks for any input.