We came to figure out an error on the controller, and to check the system. The master valve had failed electrically causing the error on the controller and preventing the system from working. We replaced the master valve. We made a drip repair on zone 1. We also replaced 7 4” heads with 6” heads on zone 3 effectively upgrading zone 3 entirely (6” PRS40 heads matched with MP rotary nozzles). We replaced 1 4” head with a 6” head on zone 7, and 1 more 4” head with a 6” head on zone 8. We checked our work and spoke with the customer. Note: The remaining spray heads are contractor heads. When they start sticking, it will be time to replace them. The rotors in the back yard are quality rotors.