Well I would have to disagree with that one.
In our AFM for the 75/67 there is no information on what MAch the aircraft was tested to or specific information of flight characteristics above MMO.
The standard 'the aircraft exhibits good handling characteristics throughout the flight envelope' disclaimer is about all there is.
Not that I have any reason to believe anything adverse, but what the poster of the thread is asking is not normally found in most commercial transport flight manuals.
Someone must know though !