how do you handle invalid references in w/f's?

Hello - How do you handle "invalid references" in CRM?  Here's a screenshot with an example of a w/f with 2 invalid references:

http://sdrv.ms/1631WeM

The steps are simply single line inputs with a short description, and no other information, so there doesn't seem to be much I can do with them? I'm assuming that the step logic is completely contained in the step, so if there's an X next to it, it's essentially corrupt and the underlying implementation is lost?  Is this correct?  Or is there a way to identify the specific logic in the step that's broken, so I can try to fix it?