A chimney scan is important because because wood burning fires damage the fireplace without the homeowner even knowing there is an issue. Cracks and gaps allow hot embers get into the structure and catch the house on fire. The only way to know the condition of the flue is to videotape it. Our unique system creates a 360 video of the flue so no section is left unseen.
I am not aware of any chimney sweep who actually repairs damage to the clay tile. The ones I know want to be safe and install a stainless steel liner. A typical repair of a damaged flue liner is around $6,000. Openings in the flue can allow hot embers to get to the structure of the house and start a fire.
Sample videos are on this page. Some in good shape, and some in not-so-good shape.