I would not call a Pec Minor release a simple surgery. It's still surgery and involves cutting a muscle which is important to your anatomy. Recurrent TOS symptoms can be caused by a number of factors. Some of which are an incorrect diagnosis to begin with as every Doctor has their own diagnostic testing protocal, and also scar tissue from a rib resection and scalenectomy. Nothing is "simple" when it comes to TOS. If it was, we'd all be cured and have outcomes substantially greater than 50/50 for ntos.