It know is sounds simple, but I have never done something like this myself. I am afraid if I try it and mess it up, I will make it worse. Like you said it takes "practice" and I don't want to practice on my own property. Thanks to all of you for help and advice.
Just a final question, what should it cost to replace all five valves and check out the system? I got a quote for $475.00 from a licensed contractor. I live in So California if that makes a difference. Thanks.
All of this sounds like I need to have a professional come in and do it for me, but thanks for the help.
Some of front and some of backyard values. In the front there are 2 one inch values and one 3/4 inch value and in the back there are two 34/ inch values.
Here are more pictures, some of the front and some of the backyard values.
These are pictures of the valves in the backyard.
