I disabled the accept button, so this is only an information request. Have you tried the IRS.gov webiste - for many industries there is an audit technique guide? For example, Construction is located here:
I know of no classes but thought that would help, so I'm going to opt out now so another person may be able to assist you who is aware of a class you are asking for. This is all I've ever used to assist my clients through an audit, and it's all I've ever needed.