If the manufacturer is interested in technical solving the issue, then the real data FDR and CVR of both flights are required. With the money at stake I have no doubt he is. So why should you think Boing has any benefit with tampering FDR or CVR data? It will be difficult enough to restore customer trust into that plane. So anything short of a thorough analysis yielding a transparent technical solution scrutinised by all parties including the regulatory bodies will not do.
So Honeywell would be my first shot to ask, the recorders hand delivered and the restorrage overseen by some trustable and technical savvy people.
Ask Airbus guys and some of the national experts in the regulatory bodies to participate.