As I wrote before, there is no method by which you can trim the 7x in normal condition (law).
Only when the fly by wire computers decide that they don't know anymore will it let you use the manual pitch trim.
This is the situation the crew encountered, the fly by wire system was "happy" so no manual trim available.
(just to be completely clear, there is no trim wheel and the manual trim switches do not function in normal law, nor is there a way to override the auto trim in normal law).
GC