Unpublishing a case study from the marketplace

Hello,

We published a case study that has now gone into some internal discussions with the client in question. At the moment the client wants the piece unpublished. Could you please help me unpublish/delete the case study.

Here's the link:
https://www.drupal.org/case-study/custom-drupal-module-for-flight-centre

Some quick help here would be really appreciated.