Have you got any checklists?

Sure we have! Checklists are a useful part of auditing, being a manual process of looking at each aspect on the list yourself. There is more information on the auditing process as a whole here: 04 Baseline Auditing. You might also use Checklists when producing new frontlist books, in which case our guidance in that area is here: Book files Frontlist / Born Accessible, or when advising authors on your requirements, in which case we have Author Guidelines advice and some examples of guidelines from other publishers

Here are the existing ones we have found that are in wide usage: Checklists to structure auditing and remediation but we have also produced our own, based on just those aspects that apply to static ebook files, and we have graded them by estimated complexity: Manual Auditing Checklist