Alert. Previous Fan Failure

Just set up a refurbished Dell Optiplex GX280. I received the Alert! Previous Fan Failure message once.

Please allow me a stupid question, because I'm not a computer tech...

On the BIOS Event Log, there is the one entry for the CPU Fan "Out of Range"

I can still hear the fan running, and I've restarted the computer a few times since and NOT got the message. So do I still have a fan problem?
 
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