Hi,
dufc,
The "information" (we don't have it) PF received (when a/c was operating outside* it's design) led him to an "strange behavior". We need more info to understand PF persistent NU.
...suggests to me that in essence they had no idea what was going on or where to start to resolve things.
When 3 qualified pilots fail, even to "understand timely", probably we have something very serious in the a/c (design, cert, training, operation, etc). The very basic info MUST be absolutely reliable and presented in real time by the a/c resources to the crew. Complex machines may fail in this aspect. And should not...
(*) F-GZCP at that night, operated "outside design":
1) Facing WX (icing)
2) Too high (briefly)
3) Stalled