My 900 has just gone back to Nokia for repair for the vibration rattle, and the clicking screen in the top right hand corner. When I reported the fault to them, their first response was for me to book a warranty repair. No "have you reset, have you done this or that" nonsense. As soon as I said it was rattling when the vibrate function was used they said "you'll have to send it to us for repair".
Of course, what the service people do when they get hold of it may well be a different matter, but at least the front line didn't try and pretend there wasn't a problem....
Samsung Galaxy Nexus | Asus Nexus 7 | Havin' fun