I replaced the two rear vents. Part Number 64-22-6-909-340. Cost: $43.
Couldn't find any schematics on the web to perform the installation. The stealership did it for me ($345).
At first glance, and after a super heavy 24 hours rain here in PNW, it seems that it did the trick. The battery and the rooftop pump compartment is totally dry.
I will continue to monitor and report back.