I agree it seems difficult to achieve, but i agree with Steeve too. Competence is fine. For sure i don't have the qualification but perhaps i can succeed.
I want to do it by myself because it's not only a task to do, it's because i am interesting in doing it...
For your information, i found a very interesting link with a repair manual here
First of all, i have to get the deal now.
Thanks to all of you