Customer has a main line leak we found drip valve passing water zone 3 After that repair customer said to continue with investigation he was aware since the beginning of location labor charge. After two hours of investigation we did a pipe repair on the left side of the house adding a ball valve too see if leak was before that point or after. After installing the ball valve the leak is after the ball valve in the backyard Customer said that station 5 could be leaking and we also capped that zone and leak was still present After all those repairs customer decided to add a master valve to stop the leak at least when the system is off. We added a an add a zone and ran 60 feet of wire We checked the rest of system and the system is working fine We advised the customer the leak is minimum the leak will be present only when the zones are on.