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Problem Solved

It turns out that one of my Heaters had gone "weird". That would also explain why it did it when I turned everything off. it was the heater heating and cooling and expanding etc.... I took that heater out and put an EBO in it's place. I haven't heard the sound since.

What a relief.

And Now I know my Insurance covers $50000 if something does go wrong.

Thanks again for your help.
 
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