A gasket failed on my lower unit last winter, it filled with water and then quit working. I have since rebuilt the unit and it worked fine, except for the I -Pilot. I realized then that is was the wrong brush assembly board and replaced with the correct one. It then worked great, but notice some water again coming out the head when stowed. When I opened it up, not only was it filled with water, but it was filled with silver liquid that looked like mercury. No idea what would cause that. I don't think I tightened the bolts enough and that is how the water got in, but I can't explain the silver metallic liquid. Any ideas?