You didn't say CW or pump associatef. Not sure of the plumbing on your 30 but i've replaced our CW (shurflo) due to leakage issues. IMO, they don't make much noise. Maybe the downstream pex vibrating. Also generally there is a lot of plumbing in that area, so not necessarily CW connection related.
If it's pump associated, search accumulator tank...a whole different universe.
Maybe pull the CW connection from the TT an inch or so for a better listen.
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WashMoBob
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