Cowl Water Issue

There is a raised lip in the cowl area, above the box, that you are feeling. About 1/2 to 3/4" high. If it rusts at the bottom; vent box leak.

You can; stick hand up there, sand, while your body goes into cramp mode, do it again, clean, rub ospho on it. Wait a day, then reach up and blindly smear the sealant of your choice all around it.