You will I suspect be able to obtain a class one with some murmurs but not all, so the authority will need to diagnose WHAT the underlying pathology is. It would be sensible to obtain as much information from your family doctor in advance and take with you. If you have had an echocardiogram you should be able to obtain a written report. Be prepared to be sent for extra tests or referred to a cardiologist unless everything has been investigated and reported