In 2 weeks, the Tokina repair center, located in Netherland, received, repaired and sent me back my lens via UPS and try to guess ? Nothing to pay :)
I tried again the famous test and it works !!!
Next step will be to use it intensively during next week-end competition in Laurac.
The only interrogation point that remains is that I don't know what they did on the lens. It is just mentionned: Aperture Repaired :( Is it a new firmware ? Did they change some parts ? I'm just curious.