Without judgment, I will go with the auditee and walk through the corrective action step by step, and ask questions along the way to qualify if that step is suitable and will do as expected and satisfy the requirement. I ask a lot of questions so that the auditee will learn to answer questions without emotion and will satisfy themselves that they have indeed solved the problem. This hits a few points: problem solving skills, auditing interviews (as they learn what questions AND how to answer them), and table discussions and dry-running. This also gives the auditee the confidence to identify and solve future problems. So, through a lot of pointed and direct questions, the auditee will understand if the corrective action will be effective when implemented, or change anything to ensure effectiveness, and be able to explain to management as well as the registrar.