Ok, while my shit is down from changing the prop nut seals, I thought about other shit that I could check. Mine is an 07'. I have never changed the upper seal or plugged the so called vent on my lower unit. So can the seal be replaced without pulling the power head, or does the lower need to be pulled to change the seal and plug the vent. And also, what the hell are yall plugging the vent with anyway? Lets see some pics.

pull the power head.