D.O.G,
The Tasmanian accident report is a matter of disagreement, those of us very familiar with the it do not believe an autopilot runaway nose down was the problem. We do believe severe negative G was a factor.
As to the most recent, it was a very low time aircraft, delivered in the last several years, and in my experience all GAM aeroplanes were maintained to a very good standard.
Coastwatch has nothing to do with it, the AC structural problems have a history almost as long as the type, go have a look at Steve Swift's paper, the link is several posts back. At the time a bunch of Coastwatch aircraft were sold off, all the ones I surveyed had low times on rebuilt wings, with new sparcaps, straps etc.
Tootle pip !!