The contact owns a 2018 Nissan Murano. The contact stated that the rear driver’s side carpet was significantly wet. The contact noticed that there was mildew on the rear driver’s side carpet, in the cargo area, and on the seat belts. The contact also stated that there was condensation on the interior side of the windshield and in the interior side of the rear window. The vehicle was taken to the dealer where the roof was taken apart, but the water entry point could not be determined. Additionally, the contact stated that upon opening the driver’s side door, the speakers made an abnormal popping sound. The vehicle was taken to the dealer, where the door regulator was replaced; however, the failure persisted. The vehicle was taken back to the dealer, where it was diagnosed that the AV auto control unit had failed and needed to be replaced. The contact stated that the failure was draining the battery, causing the battery to be replaced once. The vehicle was not repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 95,356.