I just came off reading a book "How Boeing Defied the Airbus Challenge" written by a retired Boeing executive Mohan R. Pandey and my head is full of ETOPS. The book implies that the additional ETOPS rigor in design/testing enhances the overall safety. Does anyone know or have the expertize to say if RR would have probably found the problems if the engines were required to undergo the additional rigor required for ETOPS certification?