Hi Geoff,
We don’t have docs that list specific class for each module, you will find these classes in appropriate css file of each module. In case that we override style for one module, you can find its css file in: //template/ja_community_plus/css folder: http://prntscr.com/24xsif
You can take advantage of editor like Firebug in Firefox (or Inspect Element in Chrome), it will be easy to find which class that module is using and where you can edit: http://wiki.joomlart.com/wiki/JA_T3_Framework_2/FAQs#How_to_use_Firebug
Please post a URL to your site here and details of what you’re trying to accomplish (switch Optimize Css in template manager off), I will give you suggestion.