I'm not sure I ever actually noticed the raw water strainer's color before, but today as I was changing my first impeller I noticed that the housing for the strainer is QUITE green/blue and corrodey, and the housing that the impeller pump is sitting on looks like it's got some green on it, too. Is this galvanic corrosion? Or leaky saltwater somewhere? My zincs are fresh as of last November (including the heat exchanger) so I can't tell if this happened a while ago or is still happening.
Any recommendations on further diagnostics to quiet a worried mind? I do sometimes notice a tiny bit of water in the engine compartment underneath the raw water strainer, so it could either be seeping out of there, or from somewhere else - it's sort of a low point that a lot of different water runs could end up in.