Got a new center section from a very reputable shop this winter, it came in a box and the yoke was damaged from someone dropping it. I sent it back for a new yoke, installed everything, and broke it in very easily for ~200 miles. I go to change the 80/90 oil and checked it with a magnet and nothing was ferrous, but looking in the pan I saw all of these bronze/brass fillings...I am NOT happy to say the least. It's a yukon aluminum through bolt with a Tru-Trac in it. Mild 460rwhp. What do i need to do now and what is causing these fillings?