We came to figure out coverage issues, and check the system. The coverage issues, and really all of the issues were cause by the zone valve for zone 3 being stuck open. As soon as the master valve was opened, water started pouring out of the heads for zone 3 and a small river was running into the culvert. We dug up and replaced the valve for zone 3. This effectively stopped a major leak, and solved the coverage issues. We did upsize a nozzle on zone 2, and we changed a cracked nozzle on zone 4. We turned the system back on, made all appropriate adjustments, and spoke with the customer.