I'm not a professional, and not an exceptionally gifted DIY'er, but I think the valve is the problem and that I can probably handle it. The water man knocked this morning and let my wife know that our bill was going to be huge and we had to have a leak somewhere. It's been so dry here that I haven't noticed any damp spots, until now. There's a leak from the lowest sprinkler head, and I think it's because the valve won't close all the way. They're rainbird heads, manual turn. Unfortunately I can't just cut the water off to the sprinklers without cutting it off for the entire house. I took a pic of the valve, and you can see that it's not perpendicular, and I can't turn it further. Does it need replaced, or can it be repaired, and what exactly am I getting myself into? Thanks very much in advance for any help!