I have to qualify my every year vote because I don't replace the parts unless they appear to be damaged, like a needle valve that has no needle part left, for example.
I do however give it a thorough cleaning and inspection and replace the gaskets after complete disassembly.
For me, the payoff lies in eliminating a potential source if trouble develops with the engine.
I also like knowing it well enough to be able to strip the thing down on the dinette table in a rolling sea without losing track of what's what. Sometimes it's a long way from an Internet connection and those on the forum who are always there to bail me out!
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