Mine is leaking too on the rear windows, left & right hand!
I'll try to fix it with some kit and when this don't solve the
problem, I will take them out and reinstal...
I do believe there is a "flaw" in the design. Just under the
visible seal at the rear end is an opening between the outer
plate and the inner frame. It looks like there was a drain
provided and they forgot the tubing!
W124 300TD turbo