Ok guys, I have a customer that I do monthly maintenance for at his restaurant. His office has an old sprinkler system with a few problems. As I am trying to add his office to my monthly list I am trying to repair the irrigation. He has 3 zones. Zone 2 the valve is sticking open and will not turn off water flow, zone 3 doesnt work at all. The problem is I cant find the valves for these two zones. The installer and the designer refuse to help. I have searched everywhere, short of digging the line up is there anything else to try?