From the article:
Couch and Huntington Ingalls spokesman Beci Brenton declined to say who made the bearing that failed.
But General Electric Co. is responsible for the propulsion system part, and the Navy program office said in an assessment that an inspection of the carrier’s four main thrust bearings after the January failure revealed “machining errors” by GE workers at a Lynn, Massachusetts, facility “during the original manufacturing” as “the actual root cause.”
Deborah Case, a GE spokeswoman, said in an email that “GE did produce the gears for the CVN-78. However, we are no longer producing gears for CVN-78” and “we cannot comment on the investigation.”
https://www.bloomberg.com/news/articles/2018-05-08/carrier-suffers-new-failure-at-sea-as-u-s-navy-seeks-more-funds