In the course of examining a trademark application, the Examining Attorney may identify issues that preclude registration of your mark. They may be substantive (i.e., there is a fundamental flaw with the trademark you wish to register) or procedural (i.e., there was a problem with your application). Any issues the Examining Attorney identifies will be described in an "Office Action," to which you must respond within six (6) months of receipt.
Status Code 756 means that the Examining Attorney has identified issues with your application that will preclude registration. They may be serious, or they may be merely procedural issues. The Examining Attorney will prepare a written Office Action to you explaining the issues with the application and informing you what you need to do to proceed to publication. which at this point, has not been mailed. Therefore, there is nothing more you need to do now. For more information on the Trademark Application Process in general, visit: