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A sunroof "leaking" is no more the fault on the manufacturer than an open window leaking. They are not designed to seal perfectly when closed which is the reason they have a water tough in the roof around the edges of the glass. And drains on each corner.

They only "leak" when the owner allows debris to clog the drains. In my case I was doing that by parking under trees and then opening the roof with tree droppings on the glass. Driving a short distance blew the debris off the top of the glass and into the drains. Of course nothing happened at first because I only opened it on nice days. Then when it rained some water got past the closed roof built up in the trough and greeted me by dumping down my back the next time I drove either with the roof open or closed.

The fix is pretty simple. Keep the drains clear by driving far enough for the wind to blow any debris off the roof before opening it.
 
Once you understand how to avoid getting debris into the drains by simply not opening the roof when stopped after parking under trees you can use the roof to your heart's content.
 
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