I asked several SA in Europe they all said they fix other things but would not touch the leather, I'm so glad I have US to do my spa. When I said this to my Europe SA "US chanel" does re dyeing, they said "no can't be true" lol.
Anyway a highly trusted SA in US told me they send most bags to highly trained local cobbler for spa. So to prove if SA was correct, I went to check out cobbler myself and Wow there cobbler took me inside shop and I saw bunch of Chanel bags sitting and waiting to be refurbish. So US send bags to Paris, only for rare occasions such as if it can't be fixed in US.
I learnt a lot!