Kurt,
I'd like to step back a little, if that's okay.
1. There is a display option on Simulink models that visual cues (badges) based on library links status. To access it, you can select Display > Library Links from the Simulink menu.
2. Alternatively, you could always run a model-wide check to test for disabled library links. You could write your own by searching through using the find_system function, or you can use built-in Model Advisor (Analysis > Model Advisor > Model Advisor) and run some of these checks.
Best, Sebastian