Worm in there or find some young skinny Homey to take a look.
Make sure its under 70 psi, go for 50 psi.
It also can be the PRV.....
I suggest you move all the Engineering so its easy to get at next
time. Sounds like now is the time.
Plumbers charge more when they are pissed at a job.
We call it the BS Factor.
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