USDA
A GEnx engine undergoes testing -- this is the make of engine used on the 787 Dreamliner.

In late July a Boeing 787 assembled in Charleston took off for a test flight and in its wake left mystery debris and fire near the Charleston International Airport runway.

In late July an investigation into the problem began, and Friday the results arrived.

The investigation into the failure of the fractured "mid-shaft" on the GEnx engine has, so far, only lead to more concerns.