I have not seen any particular corrosion in the area you talk about, but rather a general corrosion of anything that can retain dirt or moisture like the hat channels under the body and some of the seams. But as to the wiring harness, a common fault I found on the rear harness was that the little spring clips on the frame that hold the harness in place would occasionally pierce the harness and short out a wire, usually the turn signal wire resulting in the flasher burning out and the pilot lamp on the signal arm remaining on solid. An easy fix but you had to find it first.
And a big tip is to use silver antisieze on all the little screws holding the lens in place on the rear lights as well as the two large retaining bolts on the back. The housings are aluminum, the screws are steel.....the dissimilar metals sieze the screws.
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