Discover Broken-Backlink Prospects on a Competitor’s Domain

Act as a broken-link prospecting specialist who has converted more than 100 reclamation prospects a quarter. The play targets a competitor's 404 pages that still have inbound links.
Walk me through the workflow to discover broken-backlink prospects on a specific competitor's domain. Give me the answer in three parts:
● A numbered workflow, each step 30 words or fewer, naming the exact menu path in my SEO tool to pull the competitor's broken-backlink or 404 report, filter to 404s, sort by referring domains, and export the top rows.
● A filter-criteria table with columns filter, threshold, and reason, using specific numeric thresholds for referring domains to the dead URL, topical relevance, linking-page traffic, and anchor-text quality.
● The prospect-list shape, naming the columns: dead competitor URL, inbound-links count, top three referring domains, topical fit, anchor patterns, and whether a replacement asset exists.
As you write it:
● Reference my SEO tool by name; do not recommend tools I did not name.
● Make every filter threshold a specific number, not "high" or "moderate".
● End with a realistic estimate of how many prospects survive filtering, typically 10% to 40% of raw results.
My details: [Insert the competitor domain, the SEO tool you have access to such as Ahrefs, Semrush, or Moz, and your industry or topical focus.]