The risk registry is a document that records the identified risks, their characteristics, their status, and their responses. It is a key input for risk management and a source of information for project stakeholders. The risk manager should review the risk registry first to understand the current state of the project risks, especially the ones related to the client's vendor, and to evaluate the effectiveness of the risk responses implemented so far.
Enhancing risk identification, reviewing the contingency reserves, and creating a risk response plan are possible actions that the risk manager may take after reviewing the risk registry, but they are not the first thing to do. References: PMI Risk Management Professional (PMI-RMP)® Exam Content Outline1, PMI Practice Standard for Project Risk Management2, Risk Management Professional (PMI-RMP)® Cert Guide3