Hi, factsonly! I want to believe that I have found the solution.
The condition: We dispatch without ELAC2, the rest systems snd computers work properly. In that case the elevator is controled by the ELAC1 via the blue hydraulic jacks ONLY (FCOM1.27.10 p.6 and p.8).
In the flight, suddenly, the Blue hyd. system fault occures. The system does not shift pitch control to SEC 1 or SEC2. (FCOM 1.27.10 p.6 and p.5) because the ELAC 1 is still availiable.
Consecuence: we don't have alevator at all.
Correct me if any doubt, please!
Con respecto!