It mentioned the "elbow". For all intents and purposes, it is the same thing. There is joint in the arm that is the problem. Imagineing noticed the problem early on and suggested an increase in the maintenance schedule to fix it. Due to the area being incredibly hard to access, the increased maintenance was never performed. (there have been some that have suggested that even the original maintenance schedule was never followed).
Weather that issue resulted in damage to what is essentially the yeti's back is still a bit up in the air, but if I am not mistaken
@marni1971 has indicated that is has.
I do not believe the
"other structural supports" refers to the foundation, but instead to other structural elements inside the AA as the post you quoted explicitly states otherwise.