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My expansion vessel has broke , can I do it myself or do I need an engineer to do it? If I can do it do i just drain whole system an swop it over?

hi yesterday my red zilnet expansion vessel starting leaking from the seam. I have bought a new one from screwfix but I am wondering is ok to replace myself or should I use a heating engineer? if it is ok to do myself do I just turn the water off at mains and electric off, then bleed the...