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thank you for your advise,much appreciated,i have just noticed a radiator seems to leak a little seems to be when the heating is off ,would this be my problem,and also one more question if the expansion vessel needed replacing would there have been a noticeable leak.all this seems to have...

can anyone help with my problem my combi is losing pressre daily,i had a plumber tell me it was a prv and the expansion vessel,so i paid him 232 pound to fix it buut i have the same problem and its driving me mad,any answers would b really appreciated .