I’m in Europe, so it’s probably a different story.
My bumper-to-bumper warranty’s up but I did not have to pay.
Mobile service came, the guy opened the trunk and pulled back on the rubber tube protecting the harness on its way from the body of the car to the trunk itself. He verified the colour of a cable (I guess different revisions have different colour combinations) and the overall conditions of the cabling. He confirmed there was no need to replace the harness, put the rubber back in its original state (more or less...) and installed the plastic guide.
All in all, it took maybe 5 minutes.