Back in October it rained non stop for 2 weeks straight. I was sick and didn't leave the house for several of those rainy days. When I recovered and went out to the car to go somewhere the drivers side floor had a puddle in it.
I've had the sunroof drain clog up before and it always dripped in from the light behind the sun visor, and this time the light was dry. I checked the sunroof drains and they were draining, so it was coming in from somewhere else. Our neighbors have pine trees which drop pine needles and those worm like things all over the place. I'm constantly cleaning them from behind the windshield wipers, so I figured that the pine tree crap had clogged up a drain down in the firewall area somewhere. Using a flashlight to look through the vent things under the windshield wipers I could see a ton of crud piled up in there.
I took the car and had the inside cleaned and detailed, it needed it anyway, and had them blast the tree crud out with a pressure washer. I didn't have any more leaking, but a day or two after it would rain I would always notice a wet carpet smell in the car even though everything was dry.
Then in March, after returning home from a trip up North in the snow, I took the car through a tunnel wash to get the road salt off, and I noticed water pouring in from behind the dash.
I broke down and took it to the dealer. I told them it was not the sunroof. They said there is a drain down in the area under the windshield wipers, but you can't get to it. They said they blew compressed air up into it from the exit, then hit it with a pressure washer from the top, and repeated until it was clear. They also trimmed the sunroof drains in the door.
I haven't had anymore leaks since then, and we have had quite a bit of rain recently. I still get that wet carpet smell after it rains though, so I'm still worried. The last time I got the smell after it rained, I felt the carpet up behind the dash and the insulation underneath and it was all dry, so I don't know where that wet smell is coming from.
I got my letter a few days ago. The letter does say that this service action is effective until December 31, 2011, so I think I'll just hold on to it and take it in if I start to have any leaks.