I am planning on tiling my bathroom floor and walls so I decided to be a "good diy-er" and pick up the toilet instead of tiling up to the toilet. Well upon taking up the toilet (where both closet bolts were corroded) I found that the toilet flange did have a cracked part (not major) but I was concerned with what looks like a crack around the inside of the top of the pipe coming from the floor. I want to make sure I can take on what repair is needed but want it done right. Could you tell me if there is a way to repair this without calling in plumbing professionals?