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i HAVE A 12 YEAR OLD HALSTEAD QUATTRO COMBI THAT KEEPS LOSING PRESSURE FROM 1.5 BAR TO ZERO OVER THE COURSE OF A DAY. THERE IS NO WATER LEAKING FROM THE OUTSIDE OVERFLOW AND A NEW PRESSURE VALVE HAS BEEN FITTED, ALONG WITH A NEW DIVERTER VALVE, GAS VALVE,CALORIFIER,AND PCB. THE PRESSURE DROPS...