Upon investigation we found the pressure regulator attached directly after the master valve and it is cracked and that is the source of the leak For this repair we will need to remove both the valve and regulator. I recommended switching the regulator to go before the master valve and we will replace both components in order to make the proper repair At this time we replaced the master valve and pressure regulator Replaced one leaking head Ran system and ensure repairs were successful and they were successful. Pressure was regulated and system is optimal I did mention to the customer that the isolation valve handle before the backflow is in fact gone.