Customer is losing excessive pressure when the system turns on. We believe it to be the pressure regulator. We tested the pressure at the Backflow assembly (1st and last test cocks) and found that when the water is static (not moving) test cock had 80 PSI and the last had 40 PSI, which is a lot more pressure being lost than what’s is typical. We also found that when the water does move, the first, and last test cock have below 20 PSI. We will be sending estimates for the pressure regulator to be replaced, and if need be, the Backflow assembly.