Yiks that looks like it is right on top of the transmount. I guess I could feel for seepage up there but I would not know how to teplace that seal if indeed it is leaking.
There is a plate with two large Phillips screws holding it to the housing with (usually) a cork gasket about the same size as the plate covering the slot.
In my experience cork ALWAYS leaks eventually, so I seal that plate to the housing with RTV only and they never leak again.
