no idea
how do i check that
if the door is properly closed then wouldnt the door seal keep out water? it doesnt get wet when i wash the sills and spray water under the door to rinse.....
not that I have checked mind you. Asuumed it was dry and sorted out when the sunroof drain was cleared out.
if the membrane had failed....would it allow about half an inch of water in? if the door membrane was leaking.... how the hell does it get into the boot?