I'm debating drilling holes in my tail light assembly - I have a ton of water sloshing one of mine from when it was raining really heavy (like the worst rainstorm of the year). Other than that I get a few drops of water in one of them, but they function fine otherwise. I don't see a vent on these, but I do see that the water runs from the trunk opening and down onto my lights and that there is a plastic flap above the lights and that is broken a bit, but it doesn't look like it's anything but a wing to direct water so I don't see how it is leaking.
I took the lights off and blew compressed air into them after I got all I could out by turning them upside down and shaking them, then let them dry in the garage for a few days, but I'd like to prevent more water from coming in and I'm concerned that drilling holes will let dirt and salt in (I live in MN and they salt these roads a lot).
Drunkie, are you saying to bake them in the oven? Not understanding what you are saying when you say to press on the light and such.