Identify critical spare parts for [CompanyName] based on historical equipment downtime data and failure frequencies. Using the asset management system, extract the downtime data for the last [TimePeriod] months, and categorize parts based on the frequency of failure. The goal is to prioritize spare parts based on their impact on operational efficiency. Include the following output in your report: Part Name, Failure Frequency, Downtime Duration, and Impact Level. Provide recommendations on stock levels and lead times based on these findings.