I don't think this is behind the AvWeek paywall:
Probe Continues Into American CF6 Failure | Commercial Aviation content from Aviation Week
(NTSB) investigators, aided by GE, are analyzing remains from the 1998-built No.2 (right) engine, which the manufacturer describes as containing “very high-cycle discs.” The NTSB, which reported Oct. 29 that at that stage 90% of the disk had been recovered, is focusing on identifying potential faults with the metallurgy, machining and forging of the part, as well as the specific bill of materials of the failed engine.
Apparently the first failure of a CF6
second stage turbine disc.