Brandon,
Good thing you spotted the mark early, sometimes the the floor is bad enough to damage mainline and you end up with nice repetitive nicks in you PE when stipped under drag.
I just changed a line roller on one of my 18ks and noticed a very small mark in the other, the 10k's seem to be ok for the moment, but I am going to buy more spares for back up.
This problem has been noted in the past and I have heard it said they rectified it in later production!!??