To access the site health reports for your site, head for the Site Center, click the Tools tab, and then look for the blue See Reports button.
The report shows all the pages with issues and number of each type of issue.
The site map in the Site Center, also indicates which pages have issues.
When editing a page with issues, you'll find those errors flagged on the Module with the error(s).
Click the question mark icon in the flagged error to view our Webmaster Guide to 508 Errors.