The LEAP’s predecessor, the CFM56, is widely regarded as perhaps the most reliable jet engine ever made. Its on-wing time is about 25,000 hours. The LEAP falls far short. With advanced materials and higher running temperatures to achieve target fuel reduction goals, the LEAP so far faces engine removals in about 6,000 hours. Some of the advanced materials failed early.
Engine repairs in these cases are done under warranties, a costly expense for CFM. GE owns 50% of CFM, and shares in these costs.
Sources familiar with the situation tell LNA Boeing is or will be making claims against CFM for these issues.
https://leehamnews.com/2020/06/01/new-g ... hallenges/