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Already installed a new auto fill valve.

Thanks guys. The boilers and pump are in the basement. It is a 2 story building and much of the piping is in the attic.

Directly

I drained the expansion tank and checked the pressure. It was 12 psi and no water was on the air side so I think the bladder is good.

We recently drained the system to repair a leak. After refilling the system, the boilers started leaking from the pop off valves. The pressure at the boilers is 45 psi and sometimes goes up to 65 psi...