I have a Rycom 8856 http://files.encentrum.cz/system_preview_detail_200000376-46e5248e3c/8856 obrazek.jpg I am looking for a valve thats stuck open ( according to my Station Master 24b and the fact when you turn the main water supply on that zone starts watering). I had a clean tone coming out of the box.... I followed it up to this open zone then i started getting a crazy up and down tone. I asked the owner what else is in this area he said the main electrical line is underground. So I can't get a clean tone anywhere the 10 heads area in this area to track donw the valve. The two wires from what I can gather parallel and about 5-10 feet apart in a flower beed with 10-15 yr trees in it. IS there another way to tone chase this valve down?