All of a sudden I've found about a one foot circular soft spot (crater) under the linoleum on below the dinette seat in my trailer. There are no apparent leaks at the rear of the trailer; however, obviously water is getting in and has been for a long time. The back three feet of the floor is moldy and has suffered severe water damage. Has anyone else experienced this problem. Does anyone know where the water is coming from? The warranty has been up for 2 years. Will Airstream do anything?