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Completed boiler and ac test and tune. Boiler was almost at 30psi upon arrival, drained some water and lower fill valve pressure down to 18 psi, before firing up boiler. After boiler cycled pressure came up to 22psi. Expansion tank is not showing signs of failure but could be starting to fail.discussed with customer and showed him what to look for and determined that if the pressure keeps going up throughout the season then to give us a call and the fill valve will need to be replaced. Ac is working properly at this time.