Bought a replacement harness, and had it in the garage for months.
Finally, after hearing the old lady whine over and over again about no power windows and constant door open reminder, warm weather gave me some motivation to change out the harness.
It was quite easy.
Sure enough, broken wire was the problem.
GM really boned this design, such a awkward curve that is constantly opened and closed over and over that has such thin wires. Complete joke.
$94 for the piece was the cheapest I could find.
Having it open, gave me the oppertunity to spray some rust preventer in there also. ?