Hasn't been too many more guesses, so here's one; big roof, lots of seepage. Could it be the .12 down in Sleepy Hollow? Can't remember if its name is Swamp Gas, or if that's the 10+ that traverses nearby...
If it isn't, has anyone ever tried either of these routes? They never looked climbable every time I ventured down there, especially the undercling and smearing needed for the traverse route