I have not seen the official campaign verbiage yet (mine did not fall under either as I have the 4 bolts), but those are typically Customer Service Programs and "N" campaigns are only completed if a part breaks. Unlike a "S" campaign which is a safety recall and is completed regardless if something is broken yet or not. In most cases, a "N" campaign will also extend the coverage of a specific part longer than the original warranty. Again, I have not seen the full campaign yet for 22N06--but I would assume that is whats going on.