Harness for passenger front, side marker headlight assembly needs replacement

What is your question?

Is it possible to replace the wiring harness of front passenger side, side marker light?. It is contained inside of the headlight assembly. I noticed it was out, as I was replacing the low-beam headlight bulb. I replaced the bulb and it would not illuminate. The socket which holds the bulb, appears to be deterioated. I am pretty sure you can probably replace it, I just don't know how or where to go. All suggestions are appreciated.

What makes this problem better or worse?

Electrical related problem

How long has your 2004 Chevrolet Trailblazer had this problem?

At least a few weeks