Preflighting in PitStop Pro

How exactly does preflighting work in PitStop Pro? The typical stages in a preflight check are the following:

Open the PDF document that has to be checked.
Create a new Preflight Profile or select an existing one.
Have PitStop Pro check your PDF document against the Preflight Profile and automatically fix a number of detected problems.
PitStop Pro generates a Preflight Report.
If necessary, interactively resolve detected problems which were not fixed automatically in the PDF document.
If necessary, use Action Lists to perform a number of (advanced) automated corrections in the PDF document.
Hand off the verified PDF document to your service provider.
The service provider receives an output-ready PDF document and takes it to the final output stage, for example, for print, press or online viewing.
The image below is an example of a typical preflight workflow with PitStop Pro.