Yeah, definitely let us know what they say and if the noise completely stops when you lift the lid for the first time in a little while and during the first half an hour or so of use. I've a Genius Bar appointment on Monday. If they were wanting to make a repair as opposed to carry out a replacement, I think I'd be happy as everything else about this MacBook is fine, unlike my first. Not sure I'd be too happy having to wait 3-5 days however
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Finally got round to uploading what I'm on about. The noise is pretty much the exact same when it occurs during the first few minutes of use and when you go to adjust the angle of the screen after a while.