My '91 Hunter 30T has begun to emit an oily substance inside the Nav station on the forward, inboard portion. I can't find any moisture source or trail that leads me to think this is a outside leak. However, I can't imagine what the source is other than teak oil leaching out of the wood. I have never oiled this "desk" either inside or out, so I'm at a loss to figure out where this liquid is coming from. Any ideas and how do I eliminate it?