The Manual linked above is as close as you will come to generally accepted auditing standards for BSA/AML/OFAC compliance. Nevertheless, it will not show you "how" to do it.
Review the workpapers developed in support of prior independent reviews. Look for a program specific to BSA/AML auditing.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.