Finally Specialized Europe answered to my warranty claim. It took only six months from them to say NO in written. It must have been a hard decision because honestly they have to understand that the frame design is faulty.

The reason to deny warranty was that I had myself assembled the bike from factory box. On the box is printed: "Warranty void unless assembled by authorized dealer". There is not much assembly work really, even the rear wheel is already in place. So that was taken merely as a formal reason to void warranty. Well, if they dare to hide behind a formal reason when a three years old bike has got a fatigue crack, they of course can do that.

The important text is shown in this picture taken after I (not authorized) had done the assembly (the important text is partly shown behind the rear wheel):

After 3 years and 18124 km on odometer the chainstay gave up because an amateur had assembled front wheel and handlebars:)