So I wonder what Heavylift did wrong. I only ever had to shut one down (LP5 failure) when I flew them in the RAF.
I worked for Heavylift for 11 years from the early 90's, and I don't remember the Belfast fleet having an extraordinary amount of engine failures that required an engine change, especially considering the age of the aircraft and engines. In the early years some of the expertise came from former 53 squadron people.
Nil engine failures in my 1,100 RAF Belfast flying hours.
I did a similar number of Belfast hours in Heavylift service, and had only one engine shutdown, mid-atlantic, due to loss of oil from an accessory gearbox.