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Update: As I suspected, the debris that was burning was in the passenger side heat exchanger - tbe one I could not access. It turns out it was NOT a mouse, but the seed pods from a maple tree, the ones that act like little helicopters when they fall from the trees. Somehow they got sucked up inside and were burning. When the tech dismantled the exchanger they found actual embers still smoldering!! I haven't talked with them about the HOW the debris got in yet. But this is crazy and scary as hell....
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