I have an assembly that, when I open it, notifies me that it cannot find D:\[path]\Belt2-1^[assembly name].sldprt.  The reason I know is that the assembly was created by someone else, and they created and somehow partially removed a belt feature without saving it as an external part.  So...  How do I effectively remove this reference?  I do not see it show up as an External Reference in the assembly, or as far as I can see any of the components.