I've had my MKS for a few weeks now and just noticed this. I heard a sloshing sound when I would brake suddenly. When I open my rear doors water drains out the bottom. I looked at the weather stripping and it looks ok. I'm assuming something is wrong with it somewhere and I'm just not seeing it. I have a 3 month warranty from the dealer..Do you think this would be covered? I really don't want my doors to rust from the inside out and who knows how long it's been like this before I got it..