I had sent my 2005 Chorus 10 shifter in to be rebuilt after a crash when it was still pretty much new, and 12 years later it still shifts flawlessly. I think it was Branford Bikes that did it, at one time in Connecticut, then in Idaho or Montana, and then in Seattle right on the route that I used to take almost daily when I lived there. They also sponsored the site CampyOnly, or were at least somehow associated with it. I just checked and a version of it is still around. And I just checked Branford and they are still in Seattle, and specialize in Campy.

Anyway, I don't know the specifics of the levers, except to know that you can rebuild them, unlike a certain other brand.