EC gearboxes
I think we are missing the point here. The original cause of these failures is often an overtorque that has caused damage to a load bearing surface. This eventually results in stress fractures or similair failures. Correct me if I am wrong but I seem to remember that after an event the IHUMS is redatumed and virtually continues from this new baseline.
Regarding the 330J Puma failure I was there and involved both in the recovery and investigation. There is more to the story than revealed.