leaking shaft seal

Hello all, we have a leak above the drain plug somewhere and I’m wondering if there’s another plug I don’t know about. Or maybe it’s just the shaft seal? There was about 12” of water in the boat after 1 night in the water. The bilge pump hose was clogged too :( thanks!

I'm brand new to this site, so I hope I'm posting in the right area. While painting the bottom of my 2002 310 Sea Ray with v-drives, I noticed stains on the hull which appear to be water marks from leakage at the port prop driveshaft. The stb side is clean, so I'm wondering if this means the...