From Airlinerwatch.
Boeing introduced the Trent 1000 C four years ago on the 787-9. The first problems with Rolls-Royce's Dreamliner engines appeared two years ago in Japanese operator ANA's operations. Since then, several operators across the globe reported engine malfunctions.
Due to corrosion and cracks in the blades of the medium-pressure turbine, the Trent 1000 is already being monitored by EASA and FAA.
After a series of engine failures, FAA and EASA issued Emergency Airworthiness Directives at the end of 2017. Since then, engines with the increased risk of failure may no longer be used in pairs on the same aircraft.
The British Engine manufacturer Rolls-Royce announced in March that the problems would cost the company around 340 million pounds in 2018 and another 240 million pounds in 2019.
Rolls-Royce will probably need to correct these numbers upwards.
https://airlinerwatch.com/airline-op...for-the-787-9/