[Yum] "rollback" yum update

[James Williams]

Hi,
 
  How do you "rollback" a yum update?  If for some reason yum update packagename causes a problem
is there a yum way to resotre back to the previous version?
 
  Or is the only way to remove the package and then download the original rpm and install it.
 
  Is there a better way?
 
Thanks,
Jim
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