I received a recall notice in the mail from BJs Wholesalers that identified six, Kidde extinguishers that I had purchased over the years. I contacted the Kidde recall customer service number to find out what the recall plan was. To my surprise, they were very cordial and professional and had an organized process in place. I gave them the serial numbers from each of the extinguishers I owned (some were over ten years old). They confirmed that they were on the recall list and said that they would ship out brand new replacements for each extinguisher. After you receive the new units, they ask that you return the recalled units in the same box... I guess that they don't want you continuing to use the recalled units.
Anyway, I would urge you to take advantage of the simple recall process to get rid of the defective extinguishers before you actually need them to perform.