Thanks everyone for your ideas - I really would like to get to the bottom of why the stove failed so we can avoid it with the next one.
If it is dampers, we will install one or more before the new stove is put in. I’m not sure how to tell if there’s a problem with the door or seals.
Nothing was inspected. The pics I add below were sent to the store and then relayed to the BK Canada rep (we were told). From those, they made the call that we overfired the stove.
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