Is anyone having a problem with their sliding backglass or 3rd brakelight housing leaking?

Has anyone else had the problem that I'm having? I noticed after a good rain that my passenger side headrest in the back seat is soaking wet after it rains. I replaced the 3rd brake light gasket with a new one I bought off the internet and it seemed to fix the problem. It rained last night and on my drive to work this morning I noticed the headrest is soaked again. This is a 2nd generation 2012 tacoma access cab. Has anyone else had this problem and if yes, how did you fix it? Any advice is greatly appreciated.

 

https://www.youtube.com/watch?v=sBGL645QXeI

 

I came out to get into my 07 one day after work to find a wet floorboard. I'd had the truck about 2 1/2 years at the time with less than 40,000 miles on it. It was technically out of warranty, but I took mine into the dealer just to ask. In less than 5 minutes I was on my way home with a loaner. They replaced the rear window and detailed the truck to clean up the wet carpet at no cost to me. They kept it 3 days total to double check that it wouldn't leak.

That type of service is part of why I like Toyota.