Arrived, greeted Beth and proceeded to shut down and drain the boiler. We cut out the two zone valves and replaced with new. We wired in the two zone valves, filled and purged the boiler. Checked for leaks and fired up the boiler. One of the thermostats was not calling for heat. Troubleshot the thermostat and found it to be faulty. I worked up a price for remand Beth agreed. We replaced the thermostat. The heating system is operating and calling for heat appropriately. The boiler needs to be replaced! Took pictures and video to document the conditions. Customer is happy with service.