Came to inspect unknown leak outside on the Backflow device. We inspected the indoor sprinkler valve and it was turned on. We shut off the valve and bled down the irrigation line. We then turned on the main water shut off to the house and inspected the backflow outside as well as the sprinkler valve and there was no leaks. There was a small drip from the bleeder port on the sprinkler line but that is most likely residual siphonage from the irrigation line being full. We advised to check on the drip tomorrow and if it is consistently continuing then we can come out and replace the valve and credit back the $65 dispatch fee from today.