PERSPECTIVE -
Reasonable confusion during a maneuvering phase is understandable. However, cruise flight is radically different.
Given the 'politically correct' data distortion of ValuJet 592 - notably the impossible dive - I just don't trust this one. The NTSB is, unfortunately, famous for data distortion as early as the 'Hoot' Gibson 727 tumble.
As cited before, this crash has enough earmarks of the Copa crash that I'm just not satisfied.
I just got an E-mail that my speculation that the yaw damper was the culprit in the 737 rudder hard-over cases may have been on target, as suggested by a related series of AD notes. Therefore, this one remains 'open' in my mind.