Yes, contact 3rivers first. It is however likely that this can be fixed if I understand the location as you describe.
This is a common place for bows to crack. When the shelf is cut out, it exposes end grain. If there was or is a fluctuation in Moisture content in the bow, this is where it will come and go and can result in a crack.
It should be sanded first and then blown clean with air pressure. Then carefully leach thin CA glue in to the crack and allow to dry. Continue to leach in the CA until crack is filled.
Now sand or file to clean up.
good luck, BigJim