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Inspection and correction of ventilation system

Hi guys I recently insulated my house in the ceiling and basement. As the insulation guys enter the ceiling cavity to redo the insulation, something has gone wrong. There is condensation in the lounge area including wall and windows. May be the ventilation system has stopped working suddenly. I cant hear anything. I dont know the brand of the ventilation system. Its 6 to 8 years old. Pls inspect and advise. I am in Hillsborough, Auckland. Thanks