BMW's rust( I know it's a bad word) warranty?

[bigrobtemp]

Ok so im still getting used to my new X and it has had it's moments in the last 2 months i have had it. The thing looks great but has a small amount of rust in the hem at the corner of the drivers door. This can only be seen with the door open , looking in. It's not rusted through and there is nothing on the outside of the panel. This is probably an inch to two inch spot. I know the factory says it has a 144 month rust warranty. It's a 2005 so im well within that window. Has anyone dealt with BMW on this? Do they repair under warranty or are there hidden costs? Thanks