Certainly going to be interesting to see the root origin of the failure.
Reminded of the fan disc failure in a DC-10. Was found the disc had been machined from a piece that came from the near end of a billet, which was found to contain inclusions. Fix, discard the ends of the billet.
In the early 60's worked in a shop manufacturing steam turbines for ships. For the gear cutting shop battery back up was supplied to the cutters/grinders. Once a cut/grind on a tooth was begun it was not permitted to be interrupted, for it introduced a point of future failure.