Thanks Paul for your comments. I will be going to the boat with tools (again!)in the next couple weeks to remove the housing and inspect the t-stat. I may try soaking the whole assembly (housing and circulation pump) in some CLR, then put the assembly in a pot of water and heat it per your suggestion to see if it operates. If it does, I can put the whole thing back without pulling the t-stat from the housing and risk damage to the t-stat or seal. Next will be the PRV's. BTW, I may not have mentioned, but my motors were originaly FWC, they were converted to RWC in 2004 when they were rebuilt.
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