I have been using the same Campy Record 10 levers since 2004. All told there are probably 15-16k miles on these, and the area I live in has a lot of rolling terrain so there is a lot of shifting (mostly from the 14-19t cogs). They levers have always performed flawlessly, although last year I noticed the throws on the right shifter lever were becoming longer. Regardless of the longer throws the indexing was dead on. Now, not so much. The shifting is becoming progressively worse, and to downshift 1 cog, it basically requires 2 downshifts and one upshift and it's still noisy. It started to become noticeable two weeks ago and despite my best efforts to tune/clean the bike, it is basically unrideable. I have looked into other factors (chain stretch, cassette wear, chainline, limit screws, etc) but honestly everything else seems to be fine.
Does it sound like I need to rebuild my right lever? I like to do all my own work, and would appreciate any advice some of the more knowledgeable campy guys (read: Peter) can provide with respect to parts and the best way to tackle this. I'm a firm believer that it is good to do your own work (plus I find it relaxing), but have a couple local shops that I can use if the task becomes too difficult.
Thank you all in advance for your help.