The CCV lines can be changed without engine disassembly at any level.
If you're seeing the elbow starting to let go, it's probably time to change the rest of the lines as well. Go to your local NAPA, have them get out their Echlin book, and there are three part numbers you want to service the whole system - which add up to about $50 all up. Alternatively, you can search around here - I know the part numbers have been posted at least twice, because I saw them before I ended up posting them myself (I don't have them to hand.)
I'm gradually collecting "reference part numbers" to post on my site for easy lookup - I just haven't had time to befriend my own local NAPA yet, so I can spend a couple hours or so going through their Echlin books...