bob jenkins wroteDon't be a plumber.
grunewar wroteI like that expression!
mbyron wroteIt's kinda common in the baseball forum.
JRutledge wroteThis is a common term in officiating period.
From its context, I think it means, "Don't go looking for problems", but what's the reference to plumber? Electricians, HVAC's, and other skilled workers, will show up at my house, also looking for problems. They find the problem, fix it, and I write them out a check.