Looks like I will paying the dealer a visit. I noticed some of this residue when I changed my front diff and cleaned it up as well. I thought somehow it was leftover from oil change. Apparently not. Nothing big enough to accumulate on the floor but you won't see it unless you drop the front under-shield. Not hard but just a lot of screws and fasteners. Sorry for big pics... may not be easy to see on phone.
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