Roof opening panels use a wet seal; when it rains, water bypasses the seal and enters the drains. The drain tubes channel water down through the A and C pillars to the ground. When the drains get plugged up with environmental debris, the water sits in the channels and sloshes around. It can also overflow if there is enough in there.Not rear brake light or rear window apparently. Have not used a sky light window in long time and never had problem with it, however I see your pony re: drainage from there. I made appt at dealer ….. since I have had so many problems with this truck since day one , I did buy extended warranty assuming more of the same so expect this to be covered and especially since it was supposedly repaired initially. I have wanted to love this truck and do which is why I have put up with all the problems to date hoping that as each is rapiers there won’t be any new ones but such has not been the case. Am really tempted to sell once this is fixed since I could prob get close to what I paid minus my add ons
The channels just need to be cleared to resolve the issue, it’s not a defect.