patplan: Re the A321 NEO shut downs to which you refer:
2 of the incidents (THY) occurred on the same aircraft TC-LSA and both involved loss of oil pressure. And both aircraft were equipped with PW 1133 engines.
The Vietnam incident, VN-A621, occurred on its delivery flight from Finkenwerder. The engine in this case was a PW1130.
The Siberian flight VQ-BGR lost the right hand engine during departure from Moscow and this one was also a PW1133
The Alaskan flight, N922VA was the only one with a LEAP engine.