One small rule - If you don't know all the execution paths of a code and are about to make changes, beware.
Especially if your software is made of a lot of modules speaking with each other, it's difficult to know what impact one bug fix could have over interacting modules.
If you don't have an automated test suit that covers all your execution paths, my best suggestion would be a simple file search on the method changed - This would at least give you a hint of what to check in order to make sure you'r covered.
Otherwise, this might happen:
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