I would privately arrange to have an assessement completed by an eminent CAA approved cardiologist and take his report with you. I have in the past been idetified by the CAA has having T wave issues that just keep cropping up. In every instant I refer to my most recent cardiologist report and the matter is soon put to bed. No dramas. The vast majority of cases these medicals are designed to screen potential unidentified problems. If your case has been previously identifed and been investigated and found to be stable / benign or your "normal" they will move on once their curiosity is satisfied.
