In my experience, most audit reports contain the same information, regardless of the quality standard used. Here's the headings from the Audit Reports for the company I work for:
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EXECUTIVE SUMMARY
1.0 INTRODUCTION
There are three parts to the introduction:
1. bases for the audit
2. audit’s objective
3. audit scope
The idea is to give a sense of why the audit was done, what it is the audit wanted to achieve and how much effort and time was put into it.
2.0 OVERALL ASSESSMENT
The overall assessment should provide a balanced, factual summary. It should describe where performance was found to meet, exceed or fall short of requirements and give the reader a clear understanding of the current state of the area audited.
3.0 NON-COMPLIANCES
3.1 Non-compliance No. 1
Title should be clear, describe the non-compliance as a stand alone statement. Non-compliances must be linked to a non compliance with a requirement. Non-compliances should also be ranked in terms of most consequential first. There should be a detailed discussion of each adverse condition.
3.2 Non-compliance No. 2
3.3 Non-compliance No. 3 etc.
4.0 OPPORTUNITIES FOR IMPROVEMENT (OPTIONAL)
4.1 Opportunity for Improvement No. 1
The opportunities for improvement are suggestions to the auditees for improving their business processes. These are based on the audit team's experience of how other groups have addressed similar business requirements and processes.
4.2 Opportunity for Improvement No. 2 etc.
5.0 REFERENCE STANDARDS AND DOCUMENTATION
List the documents used in planning and and conducting the audit.
APPENDIX A: MANAGEMENT SYSTEM SCORING
My company prepares a table scoring against their internal QA program for the entire business. For your audit, this is where you could compare audit results in import/export/planning/production etc. I find this section is better than the text in section 2 and 3 for illustrating that problems are either localized or rampant.
APPENDIX B: AUDIT TEAM, BRIEFINGS AND MEETINGS
A record of meetings held, people contacted etc.
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As other people have said, you need to know what you're auditing "against", otherwise the auditee may disagree with your findings. Sounds like the requirements are found in the purchase orders and specifications. In which case, there are probably few requirements for management or planning to be performed a specific way.