It might be difficult to see in the pictures but there is green oxidation toward the back of the plug. I used Deoxit, scrubbed as good as I could get to, a little emery paper (gently). I let the Deoxit soak overnight and the problem has not improved.
Kind of OFF-Topic and on a side note with your reference to conductive grease. I have done research concerning Dielectric grease that is in just about every Seadoo electrical plug. That grease will not conduct electricity. My contention is that being a non-conductor it may hamper the connections inside the plugs. There is some debate about this. Personally for me, I clean all of that crap out of there and only use the dielectric grease on the sealing surface of the plug (rubber gasket) and not on the plugs themselves. I don't think my philosophy agrees with Seadoo's reasoning. But it just seem sot me that a worn plug that is not making good contact having the grease on there would make it worse. I'm still close to the fence on this decision. Ha ha.
As usual I can't believe the prices people want for old used parts. I'll keep calling them greedy criminals. I think people should be more friendly and helpful to one another but so many want top $$ for everything. Touchdowns everyone. I'll post my findings.