- Run Dead Link Finder on your list, page, or sitemap.
- Filter to 4xx and 5xx only; export CSV.
- For each 404:
- Restore the original content (if appropriate), or
- 301 redirect to the nearest relevant page, or
- Use a Wayback snapshot when content is irrecoverable (check licensing).
- Re-run to confirm.
Tip: keep server logs handy; many 404s come from old marketing URLs.