Hi Dave...
Are you referring to slightly exceeding Vne (or I guess too bumping up against Vne)? In testing, I found it very easy to overspeed (crash) the Goose when descending below 5000' or so...
But the identical flight minutes after that crashed one, I (Max KIAS) was actually faster, and the 2nd on the 18th, Max KIAS nearly identical to the crashed speed. All roughly middle of the yellow arc.
I'm thinking it had more to do with a supposed Baton Time of 23hrs 30min. (Also, there was "fluke" during my pre-flight with ASA and FSX that I ignored before that doomed flight, which I won't if it ever occurs again).