Still waiting to hear the severity of the damage due to the gearbox being involved in a road transportation accident. What actually was performed after that incident and how deep did they go on the repair ?Until that is revealed all of the folks who are swirling gearbox engineering formulas and stress analysis are just blowing smoke. Maybe it's a fat red herring but maybe fate was sealed as a result of something that happened (or didn't happen) half a world away and a long time ago. l can't help but think that the things you know about should be evaluated before the things you hypothesize about.
There is a work order somewhere that has the details and an insurance report on the accident with photos and descriptions. I suspect that stuff won't see the light of day outside a courtroom but it might be interesting.