That looks like a substantial failure of a critical flight control component, and not only one occurrence but at least three times (once the entire servo flap). The Vertical magazine article doesn't say anything about the nature of the servo flap failures, but presumably that is covered by NTSB and will also be by TSB Canada once they have finished their investigation. If fatigue, I wonder whether it could have reasonably been detected during regular inspection but was somehow missed prior to both accident? Or could it have remained hidden until a sudden failure?