I learned about a recall for Kidde fire extinguishers on this site in some thread, but I can't find the thread, so I'm posting anew:
Kidde Fire Extinguisher Recall
For the most part, Kidde extinguishers with plastic junk on top - either the pull pin or other parts - seem to have problems (apparently some emergency responders
had them fail on them and deaths resulted).
I checked all of our extinguishers, and found two smaller ones that looked likely; they were probably 15 years old but had no date code on them, but I submitted the form anyways (need to find the serial number).
The web form says something like "thanks we'll get back to you" - about two weeks later I got two new fire extinguishers in the mail, with instructions and a label to return my old ones (you call FedEx and tell them that it's a hazardous pickup, and they come and get them).
Seems to be time well spent.