I'm bringing in my retina macbook pro AGAIN for weird creaking, this time at the hinge in the back. It sounds like adhesive is letting go of it, and the genius said it looks slightly bowed. He ordered a replacement screen and told me to give the password for my main user account. My question is why. Why would they need that? While I'm not exactly keeping nuclear launch codes on my macbook, and I do have undercover installed and ready, but it's not difficult to defeat those measures. OSX boots just fine externally, as I would imagine Apple's tools would too. So why do they need that password? I could always erase the entire system and restore from NAS when I get back, but is there a reason to leave it as-is?