OBD2 scan reveals unexpected engine problems?

Yes, Joe, it makes sense that a widely used GM engine like the v6 3.8L would have a similar fender access panel. Between a junkyard find and showing a veteran mechanic a photo of the gaping hole in the inner fender, I might find something.

On the EGR cleaning procedure, I now have the speedometer cable, and probably can do it this week. The "cable" I bought from eBay is only the cable housing, not the internal cable.
1. Do I need to clip off the little knob at cable's end? I would hate to lose anything in the EGR passage.
2. Running the cable like a Roto-Rooter will produce loose soot, and that should not enter the new EGR valve. To blow out the soot before the EGR is bolted back into place, should I run the engine at idle, or try to operate the engine briefly to force out the carbon before reinstalling the "EGR? (The EGR is electrical, not pneumatic).