Just a driver here, European airline, with limited insight into the FDM. We are not told what the FDM triggers are but the word on the line is that it picks up the smallest things, such as:
Flap extension above certain speed (well below placard speed)
No flap extension within certain distance to touchdown
Operation of certain switches normally not used in daily operation
But no, never heard anything from the FDM facilitator for transgressions of above mentioned criteria.