FOREWORD Addendum b makes changes to Informative Appendix A@ Section A2.2.1.1. These changes place more specificity on the issues with the causes of refrigerant leaks in systems due to vibration. It also identifies two different remedies to vibration issues. Note: In this addendum@ changes to the current standard are indicated in the text by underlining (for additions) and (for deletions) unless the instructions specifically mention some other means of indicating the changes.