I find it hard to believe that P&W would sell engines to Airbus with a known defect and Airbus would just ignore that defect and deliver them to customers with a note:

"Congrats on your recent purchase of an Airbus A321NEO. Oh, by the way, your $130M aircraft needs to go offline immediately for inspections, because P&W continues to manufacture bad fan blades and we continue to sling those engines beneath our airplanes. If you have further questions please call 1-800-SUCK-ITT"

The issue was contaminated raw material wasn't it? Seems like they wouldn't continue using that material for new deliveries.