Find Library links which could not be resolved

Whenever I open a large model, I get a warning that a linked model can only be found in a case-insensitive match. I don't recognize the linked model, and I am having trouble finding where the block is which attempts this link. When I open the model dependency viewer, I get a pop-up dialog box that says "The following models or libraries could not be resolved: ...", and it list the one I was originally looking for and several more.

I cannot find which blocks in my model are attempting to link to these unresolvable libraries. I have tried the model advisor, the "find_system" function looking for SourceBlock, ReferenceBlock, and LinkStatus parameters. The only blocks found by find_system seem to be those which link to resolvable model links. How can I find which blocks within my model are attempting to link to these models whose links cannot be resolved?