Explanation
If an IS auditor suspects that independence may not have been maintained in past audits, the best course of action is to inform audit management. Audit management has the responsibility and authority to address such issues. They can review the situation, determine if there was indeed a lack of independence, and decide on the appropriate actions to take123. While informing senior management, reevaluating internal controls, and re-performing past audits might be necessary at some point, the first step should be to inform audit management.