This happened to me too, and I am pretty sure it was because someone tried to break in to me car because it was on the passenger side, but who knows for sure, I remember one day just noticing that my locks were loose, and used occams razor.. plus the passenger door gets far, far less use than the drivers side and the lock fell in on that side. Actually I just did the drivers side too and used blue locktite. Fortunately I had a tech friend show me how to do it on the passenger side first... not too difficult for the novice getting the window winder clip off was the hardest thing for me!!