Subaru Forester 2008: Wind noise from driver's side window

Soon after we purchased our Subaru Forester two years ago we noticed loud wind noise was coming from the driver's side window. I eventually discovered some rubber airline piping sliced in half lengthways sitting inside the door rubbers when the door was open. The previous owner must have glued it there and it eventually dislodges. I have found both sides will make the sound, and that this 'backyard" solution does work. Although the problem appears to be with the seal on the door rubbers, I don't know if Subaru is going to want to, or be able to, do anything about it. I would say it's a common fault, but I doubt Subaru will list it as a known fault worthy of a no-cost replacement!