Lee, I think that if you are on the hard now, you can assume they are all shot.
This could be the product of both a lack of bonding and/or nearby boats in the
marina being improperly wired.
You can swap-out your through-hulls with Groco flanged through-hulls and using
Conbraco/Apollo ball valves (SS balls) as reasonably priced replacements.
Perhaps your raw water strainers have survived. You'll want to bond with solid
copper wire.
Ron Rogers
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