Extremely interesting update mainly because it concentrates on aircraft systems and remains totally silent on the control positions.
My first impression is that this report has been provided to restore operator's/crew's confidence in the aircraft systems whilst not speculating about the actions/behaviour of the crew members.
In the AS355 'Harding' accident report in the UK several years ago, there was also reference to a noise 'heard on the CVR'; there was speculation about the source of the noise but it was never resolved.
Jim