Randy's right about the technical requirements. As a previous examiner and a consultant for 23 years, Reg E is one of the toughest areas to review. Many banks don't keep sufficient documentation to prove they complied - and you aren't required to do so. However, if the documentation isn't there, the auditor/examiner then is forced to start interviewing and create scenarios to test your knowledge. This typically is not favorable for the bank.
I recommend you have template letters for the various scenarios you will encounter (no error occurred, we agree there is an error, here's your provisional credit, the provisional credit is final). If you do, you'll get less questions and likely less violations as a result.