I found this article to be particularly useful as part of the knowledge base of the VC due diligence process(es).
https://techcrunch.com/2016/05/19/the-truth-about-due-diligence/
https://techcrunch.com/2016/05/19/the-truth-about-due-diligence/
The VC Lab team is currently working on a due diligence guide and I will be sure to update you with that here.