Manufacturing’s biggest unpriced risk isn’t malware, it’s brain drain. When senior OT SME's retire or rotate, plants lose tacit knowledge that no SOP captures. This keynote turns Mean Time to Replace Expertise (MTTRE) into a program you can run. We’ll unveil an Expert Knowledge System that can be built for real plant constraints. The concept connects everyday sources you already own (CMMS, downtime logs, safety events, OEM service notes, shift reports) through a context hub and converts them into Task Capsules mapped on a Skill Graph. With LLMs + RAG and agentic workflows, the EKS coaches OT personnel through changeovers, sanitation, stoppage recovery, vendor visits, and calibrations; verifies key steps with lightweight evidence; and learns from each shift. You leave with a 90-day plan to baseline MTTRE, capture the 10–15 tasks that matter most, deploy “coach mode” on the floor, and report measurable reductions in time-to-competence, hazard-misses, and recovery time. The takeaway is knowledge capture & retention: AI is your continuity lever. If you can measure MTTRE, you can manage it and you can turn institutional knowledge into an auditable, compounding asset.