Soğukken birkaç kez mars basınca çalışıyor

Hi!Found EGR all gunked up with soot & hard carbon buildup. Unfortunately EGR can't be removed (forming a one piece unit with manifold). Senseless to replace, unavailable and surely very expensive. Looks like 2nd hand (if I can get) will be the only option to keep going. First time it happens after 330K, of which was 60% long distant driving. Any suggestions would be welcome.