Guys,
All you need is a little Flex Seal.
No kidding, I bought some flex tape for my situation. I hadn't actually put it on yet.
I've had my truck for over 2 years. In that time, I've had the 3rd brake light replaced
every time, so I am on my 5th CHMSL. Still leaking. Had the local dealer (not where I bought it) keep it for 2
weeks the first 2 times it was in & 1
day the last 2 times it was in. Still leaks. On the second visit, the dealer said they saw a body seam leak. Did OK for a short time, but it's still leaking to this day. The first time the leak got addressed, I had to take it back after they replaced the RFHM under the 3rd brake light. That first experience left me waiting for a tow truck. I'm glad I took the salesman's advice & bought the extended warranty. Sounds like I'll be using it after the factory warranty is up. And the dumbest part of all of this is I can go through a car wash with no leaks.
After reading all of this, I might give the reseal procedure a try, but I'm not going to hold my breath.