Water leaking into Cab floor from rear window drain that is plugged

Apparenlty, I have debris that has built up between the bed and the cab of the truck on my 2015 SR5 Crewmax. I was told the debris plugged the drain from the rear window casuing a substantial build up of water underneath the body of the truck. The carpets and padding are soaked, mold is starting to grow, and I did not notice early on as I have floor mats covering most all ofthe the carpets. Because of the water buildup, the rear window regualtor is rusting and I am told it needs to be replaced soon, and none of this is under warranty. This will cost me $1000 plus $250 for detailing to clean the carpeting. This truck is 1 year old and a lease.
Is this really something that I should be paying for on a new vehicle? Have you ever heard of this before? Isn't this a design flaw? Any thoughts?
-Dave

 

Seems like this should be covered under warranty. Check your owner's manual, they usually spell out the warranty details.

Dealers will often deny coverage until you can prove them wrong in writing, drives me crazy.

 

Holy crap. Ask them where "cleaning window drain" is in the maintainence schedule. If it's not in there, how would you know to clean it? Toyota should be able to do something for you.

Any pictures of where the drain is?

 

It should be under your warranty. Same principle for the drain tube by the blower motor they have so many problems with.