I am one of those who have had this problem and curse Nissans choice of rivnuts over weldnuts in a large and vocal manner as befits an idea pulled from some second-rate engineer's dark and unsanitary place. See the 'previous attempts gone bad' link that 'B.' posted on this thread for all the gory details.

Long story short, I was lucky, I got it repaired under warranty. Yes, they had to pull the headliner & demolish the fairing to replace it. I couldn't get them (because it was under warranty) to leave the fairing off so I could put it on using plenty of NeverSeize, or even wirebrush the threadlocker off the bolts before they put it on. So I have resigned myself to getting under there several times a year with the air gun and hose.