Re: Water Leaks
I have had this problem, and as far I know, the source of the ingress is from the area forward of the cabin bulkhead just beneath the bonnet. (ie. the area where the wiper motor sits, or cabin air intake plenum).
I believe that the water was getting in when the car was washed, and in my case was soaking the rear carpet also.
1 There is a drain from this area, my specialist unblocked it with a long screwdriver, with the undertray removed.
2 Are you running without the underbonnet plastic trims attached?
I was, and I believe that the rearmost plastic guard keeps a lot of water from entering that plenum.
Anyway, since I had the drain cleared, and replaced the trim, I have had no recurrence, however I haven't washed the car recently!
Will update soon.