Replaced three high vents on the boiler system. Performed a complete boiler purge to remove air from the system and purged all heating zones, confirming proper circulation and heat output. Inspected and verified the expansion tank pressure; the tank was found at 6 PSI and was pressurized to 15 PSI, where it held steady. Confirmed all zones were heating properly after service. Reviewed system operation and safety considerations with the customer.
