So I did the pellet stove swap today and after I trimmed my existing liner for the new stove I was looking at the piece and I noticed holes in it. At first I thought maybe I nicked it when I was cutting but upon closer look that wasn't the case. So then I looked at the rest of the liner and noticed the same type of holes for a few more feet. I wound up pulling out the whole liner and these holes ran for the 10 or so feet of the liner. Surprised me to say the least, anyone ever seen something like this before? The liner is 7 years old and I clean it every year.