I've had the interior out. Bolts and washers had to be replaced. 4 of the 10 wall fire bricks had clean cracks but are intact and missing no parts. The hearth base fire bricks have no cracks. The insulation around the secondary combustion chamber was replaced with new ceramic fiber blanket.Before putting the money and effort into. Installing this insert correctly post some pictures of it including the interior of it hasn't been maintained properly it may not be worth installing properly