I still don't see any analysis of the following :
1. How can the engine design have been in service for 15 years before such incidents happened. What caused it to work fine on comparable flights until now ?
2. What are the specific aspects of the design that cause this to be a problem, which are not present in engines from other manufacturers, or other designs from the same manufacturer ?
3. Is there any relevance that both aircraft involved in the incidents originated at the same airport, and were quite likely refuelled from the same supply system with the same national fuel spec ?