I thought I remembered how to do this ....

I did a save as on all of my parts from xx-272-xx to xx-227-xx, at the time I thought I had changed all the drawings at the same time.  Then I went and deleted all drawings and parts with xx-272-xx, but I have found some of my drawings are still referencing xx-272-xx so know the views are gone .....

How can I associate these drawings to the xx-227-xx parts and assemblies?