Leaking windshield wiper pivots
Tips.. Mark the wiper pivot castings with a sharpie before you take them down. Rotate your mark 180 degrees when you put them back. This will put the wear in a new position. They will operate smoother and quieter.
If you buy a new vent box to cowl seal for the drivers side you can drop that vent box for working space. The other wiper pivot can be accessed through the radio or climate control opening.