For what it's worth, the spring that I found on the floor matches the spring from the "relocker" in this video:
http://www.youtube.com/watch?v=TzUduzjR9W4
at about the 5 minute mark.
This (relocker engagement) may be what has failed.
Although I can feel the hole for the relocker, I can't see it, and it looks like it would require removing the lock assembly to get to it. Then I would have the problem of where do I find the cap that holds the spring in? Again, I can't see the hole, but it seems likely that the cap is missing, if the spring was able to come out.
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