I was attaching my type cover today and noticed a thin line of what appears to be rust along the spline. I'd say it is about .25"x 3 mm. I looked at the bottom of my SP2 and noticed an identical spot where it connects. I have never had this device near liquid or humidity so I thought it might have been something else but after Googling it I found a couple people with the same problem. Apparently it has something to do with the magnets. None of those pages had any real info so I thought this would be a good place to get answers and see if anyone else is experiencing this. I will try to remember to take pics later.