If Pete can't locate one I'm sure I have a couple. Agree no real reason for the application except to address a problem and likely intermittent. Would be interesting, if we had enough examples, to graph out the examples to see if there was a pattern or it may just show that NJ had more issues with the spray mechanism than the other two plants.
If it was a fix, I wonder where it got caught and fixed since its done in black where examples of this I've seen at San Jose (maybe one or two cars from all the years there) were fixed with red oxide. Which was likely applied at the next paint section when they did the front frame rails. Not aware of the issue being found over and over during other years of production at NJ.