just cause the screws are all there doesn't mean that it's not leaking around the screws. i was in the middle of a carpet change/sound deadening job when i found the leak. i put some of the windshield sealant (3M) over the screw hole, ran a larger screw down into the hole, put some more sealant over the screw head, and then put a small patch of some sound deadener over the top of all of it. hell or be damned if it'll leak again. lol. anyhow, it's not a big job, there's a screw at each end of the black vented cowl section, and another 2 or 3 screws in the middle. it's a 3-section cowl cover. the ends hold down the middle section. and i think there's a little tab you can lift up on the wiper arms that allow the arms to pull off of the studs. probably take all of an hour for someone that's not too mechanically savvy, less if you're handy with tools.