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Check the ducting. disassemble it. Look for bad connections. It is not a big deal to take it appart and put it back together. When you do, make sure that all the hoses are clear. It is not impossible for someone to have stuffed something inside the ducts. I say this, because my plane is in annual right now, and the IA said they found a wad of insulation stuffed up inside the outflow duct. That of course affects the airflow throughout the cabin.
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