I've not shot a bow in in more than 40 years (it was a Bear Grizzly) and recently acquired a Bear Tamerlane at an estate auction. My question has to do with the structural integrity of the bow. Both limbs, where they attach to the grip have what appear to be cracks about 5 inches long.. not deep and can barely feel with a thumbnail. They run lengthwise. It's a 35 pound pull and I"ve strung it and shot two arrows. It seems to do just fine. Do these cracks indicate impending failure of the limbs?