So I was doing the summer deep clean of the flue and stove over the weekend. Swept the chimney and then vacuumed every bit of everything I can get out of the firebox. Well I pulled off the cat shield and inspected the cat. It was a nice grey color, even all the way across. I was using a nice bright LED Cree flashlight and I noticed that there are cracks diaganol across each of the three cells that make up this large cat. No material has fallen or is eroded but the light shines through these fine cracks. I burn well well seasoned wood. No overfires, the stove has worked very well. Is this typical? Should they look new for the 10 years? I took some pics but you can't even see the cracks.