Interesting read and time line WAH.
The HUMS graph appears to show the failure time line especially from 193 to 40, was this ignored \ filed due to lack of understanding I presume the times were inserted after failure of item, and with hind sight.
In 2001? was so little known that it did not raise questions in engendering\ HUMS department?.
As a pilot and engineer it would have made me ask the questions regarding the leap in readings at the 193+ point even if I did not understand the graph enough to pick out the previous information