Use tools whenever possible to turbo-charge your content audit/DITA code review.
Consider usage of the <b> element in DITA. Bold has no semantic meaning.
Getting users to stop using <b> and use a semantically meaningful tag instead for content (such as <uicontrol>), is part of the DITA mandate.
You can use the CSS to focus writers and reviewers on use of problematic markup. For example, you can display content marked with <b> as purple text on a bright yellow background.
Consider use of search scripts to identify “known issues” (such as overuse of conditions).