Bearfoil
My memory of ACARS is that both PFDs crapped out, and IRU is dependent on AD,
If you read back into the old Thread plus BEA's analysis the common understanding seems to be that there is no inidcation the PFD's were u/s.
Also the IR part is not dependent on the AD part.
Only the other way round, if there is no IR, then AD is blanked out on the PFD's as well.
None of the ACARS messages indicated that attitude information was lost.
BTW. thanks for the explanation of your motivation.
I can follow that logic and it's OK for me unless it would be mainly used to spin the public opinion in the wake of a lawsuit.
Keeping the public interest up and keeping the spotlight on this accident should be in the ineterst of all involved in aviation.
But I would be grateful if you could avoid oversimplifications which could imply things which are not meant to be.