I have owned my E28 for about two years and sail in the San Diego area. Just recently I noticed what appears to be galvanic corrosion forming on the shaft packing area just inside the hull. I do not see any evidence of zincs anywhere in the area, and nothing in the owner's manual mentions zincs on the shaft inside the hull. I have studied the example in Calder's Boatowner's Mechanical and Electrical Manual, but I don't see any evidence of that arrangement on my prop shaft, but I am not sure it even applies in my case. I am not a mechanic, so if this gets too complicated I will have to pay to have it fixed. If it is a simple fix, I would like to take care of it myself. Any suggestions?