So, after doing some research what I have figured out is that the dropout is aluminum and it is bonded somehow to the carbon fork. The other side is also showing "wear", nothing loose, but a very faint line where the two pieces meet. Trek said to bring to dealer with receipt, which I don't have. Hopefully will not be to big a problem and they will work with me. No abuse, no crashes, do not over tighten when putting the wheel on. I am crossing my fingers...