Some ETP iParts were renamed or removed from the iPart Gallery, and this affects all content records on which you placed these iParts. Be sure to walk your site so that you can discover and address any page errors arising from upgrades to content and iParts:
1. Navigate through your upgraded WCM site and note any pages that show errors.
2. From Content designer > Manage content, delete the problematic content records.
3. Recreate the content record using the renamed iPart or another iPart, as appropriate.
4. From Site designer > Manage sitemaps, select your site and Edit the affected navigation item to point to the new content record.
5. Save and Publish your changes.