This article popped up on my newsfeed. Seems the GE9X engines are not quite ready yet. The logistics of moving them back to the factory are a story in itself:
https://www.flightglobal.com/news/ar...r-issu-460379/
GE Aviation is recalling four GE9X powerplants from Boeing to address a previously disclosed engine compressor issue that already forced Boeing to delay the 777X's first flight.
News of the recall surfaced in a 19 August regulatory filing with the US Department of Transportation (DOT) by Russia's Volga-Dnepr Airlines, which has applied for rights to fly the engines from Washington state to Ohio.