I stupidly used a face instead of a plane when creating a mirrored part.  The original part changed somewhat drastically, and now the mirrored part can no longer find the face.  I can't seem to find a way to fix it.  It wouldn't be an issue if the mirrored part hadn't already been checked into the pdm vault.  Any suggestions on how to just point it to a plane to fix it, or do I need to create a new one?

SWx 2013

Jason