FYI re MD-11 return to operational status.
"Yes, the upgraded pylon aft mount spherical bearing mandated by the FAA is the exact same redesigned bearing Boeing designed in 2011. [1, 2, 3]
Following previous spherical bearing failures, Boeing issued a 2011 service letter that introduced a new bearing part number, P/N S00399-523, which removed the design recess groove on the bearing race that was causing stress fractures. However, Boeing deemed the failures non-critical to flight safety at the time, leaving replacement with the new part as merely recommended. [1, 2, 3]
Following the fatal UPS Flight 2976 accident, the FAA and Boeing mandated that carriers replace the older, flawed bearing design (P/N S00399-1) with this redesigned 2010s part. [1, 3]"