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Utilizing root cause analysis is an effective method to determine the main cause of a failure because it involves a systematic process of identifying not just the symptoms of a failure but also the underlying issues that led to it. Root cause analysis typically employs various tools and techniques, such as the "5 Whys," fishbone diagrams, and fault tree analysis, to delve deeper into the problem. This approach enables a comprehensive understanding of the factors contributing to the failure, allowing for informed decision-making and effective corrective actions.

The other methods, while useful, often provide more limited insights. Reviewing maintenance history can help identify patterns and recurring issues but may not pinpoint the underlying cause. Conducting visual inspections is valuable for identifying visible signs of failure but often won't reveal the root causes that are not immediately apparent. Contacting the manufacturer may provide useful information or troubleshooting tips but is not a systematic approach to diagnosing the root cause of a failure. Hence, root cause analysis stands out as the most effective, thorough method for addressing and understanding the main cause of failures.