I'd be interested to know if you fixed your problem. I have the same problem on the passenger's side, same scenario. It drips in from the middle. I've had the dealership look at it twice. First time, they replaced the jute under the carpet and the insulation around the door. It happened again the next time I drove in a hard rain storm. It's happened when it sits in the driveway during a hard rain storm. I just took it in for service last week and had them look at it again. They can't get it to duplicate the problem by running water over the windshield. I haven't had any modifications done to it so not sure where the water could be coming from.