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I HAVE A 6 YEAR OLD SIME FORMAT BOILER BOILER,WHICH IS ONLY DELIVERING LUKE WARM DHW AND THE BOILER PRESSURE IS READING 3.5 BARG. AN ENGINEER CLEANED /SERVICED THE BOILER PUT THE DHW REMAINS LUKE WARM AND THE PRESSURE STILL REMAINS HIGH EVEN AFTER HE CHANGED THE NON RETURN WATER FEED VALVE TO...