It depends, official OEM parts are hard to come by and will be old stock if you do. The second stages use common parts so servicing them is not an issue, some of them were really good. The first stages are a different matter. Not only are parts hard to come by, Dacor was notorious for changing the internal design of a reg so 2 "identical" ones may well have different internal parts and there is not way to know except by opening it up. Some of the parts are interchangable and others not...bottom line, the second stages are worth keeping if you service them yourself, the first stages are not really worth the trouble.