Looking for some advice. I have a Fisher free standing stove not sure of the model. Has double doors, 5 fire bricks across the rear of the stove and 8 in out the back flue pipe. That vents into a 8x13 chimney. I had a small thermal event in the chimney and called a company out to inspect. They tell me liner is cracked and needs to be replaced. They are recommending to replace with 8in liner. I have zero problems with the way this stove has burned for the past 27 years. This is a 2 story home withe stove in the basement. Not sure if installing a new liner will work with my current set up. Or should go with a smaller liner a newer stove. Thanks in advance .