BizRuleAnalyzer is THE ONLY TOOL which effectively allows searching all code in business rules and in custom forms. This allows you quickly finding if a field can be modified inside rules or inside forms. This will also allow significantly better review of your Encompass Customization.
First, all search results show form code in the very bottom section:
Second, all Form Code matches have links to review actual code:
Third, when you click on such links, complete form event code is opened for your review with the actual code line preselected: