http://www.atsb.gov.au/media/2891300/vh-oqa-fig14.jpg
A follow up on my post above re: the Drive Arm/Wheel fraction.
Notice the fracture area at the central arrow. It is beaten while quite hot, imo. Also, the surface of the Drive Arm area appears that it spent some time
within the remaining (shaft) area of the Drive Arm, or the inner Stator ring. The failure furrow is worn smooth in this area, while remaining crisp further out. Also, the outer 'layer' of metal is peened off by the inner Arm. The metal spatter appears to be bits of molten Drive Arm, supporting a theory of intense heat from kinetic or Fire products. However, that begs the necessity of the Fire being in the IPLP cavity, not in the area in front of the Wheel (bearing case). In fig 8 we can see what is left of the Stator at its center closest the IPT. Out of view is the area of contact. The Oil quantity hadn't depleted, although it did read once at 11 quarts, but returned to twelve to remain there.
So what of the stub pipe? At ~5/8 inch and a pressure of ~65psi, one would think a serious loss of Oil, but the quantity read doesn't show that. The Temperature of the Oil is elevated, and that shows some tramp heat, but perhaps not a Fire at the area of scavenge??