Our 13485 auditor found that some of our corrective and preventive actions lacked adequate verification or validation activities/documentation. My question is, how would I go about completing an investigation and root cause analysis on a procedural problem? I find myself repeating the same things for both......when completing an investigation/root cause analysis for a specific issue or problem, the investigation and root cause analysis are fairly straight forward, but I'm having trouble with what to put on procedural corrective action reports. Any suggestions? Thanks!