Nice picture! Looks like a very pretty bike, nice colour! OK… I'd clean the shifters, and make sure that the washers were assembled in the correct order (I'm sure there's a diagram or instructions somewhere on the web); use maybe just a smidgen of grease when you re-assemble.
I've had Suntour, Campy, Shimano, Benelux, Huret and Simplex over the years and I've found Campy to be one of the best, and the most long-lived in terms of performance. Just clean and check the assembly.
- Wil
PS: Just took a look at the rest of the pics. Don't you DARE convert it! It's much to nice for that!!!!!!!!!