Some of the image references in EN-US site got updated to Japanese assets in author.Twenty percent of the asset references were updated to Japanese. The page/components do not have 'jcr:lastModified/jcr:lastModifiedBy' etc properties added so that we can figure out when the update was made.
A project for Japanese locale was sent for translation when this happened.
We need help in figuring out which service or event would have caused this.