OD drain ? not sure. The water that came out was a little milky. Also worth mentioning is the fact that outdrive went back down on its own, it didn't stay up.
My boat, a 84 Thompson has been sitting all winter until now. I moved it to a new location this AM therefore I had to trim outdrive up to travel on the road. Outdrive raised up, but went back down. When I lifted it manually to strap it up, water came out from somewhere on leg. Not really sure...