Kipikipod, a few years back when I had the same problem as you, I have called
Focal directly in France. Not only were they speaking English (this is a big deal
in France!) but they were also very friendly and assured me they will repair my
speaker then and also in another 5 years if necessary. However, they have
asked me to contact our local Focal distributor. Apparently it is the job of the
local distributor to replace broken tweeters and drivers. Just call your local
dealer and he should clarify everything for you.
In my case, the local distributor was very helpful and prompt. He told me
when their car will be in my city delivering speakers, and also where I should
drop my broken speaker, i.e. the name and address of a hi-fi store. I was
charged only the cost of the tweeter (no additional costs for shipping and
repairs).
Success!
Paul