According to the FDA guidelines an internal audit should cover the following topics:
FDA CFR Volume I – 4.14 Internal Audits
An internal audit procedure template can be found here:
An example of an internal audit schedule can be found here:
Audit
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Before starting the audit you might send an audit questionnaire to the vendor/supplier to gain more information from them before beginning the audit. The link below contains an example questionnaire:
During the audit you can use a simple checklist to record information. The link below contains an example of a checklist
Finally once the audit is finished an audit report must be produced. Here are two examples of audit reports: