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Here's a picture. In the middle of the picture you can see the black interior fan motor mounted into the white housing.
There is also a black tube/pipe that comes from the interior fan motor and connects to the white housing.
At the bend of the black tube/pipe you can just see a brown connector, this is the connector for the resistor. Just disconnect the connector and undo the two screws then you can pull the resistor out.
Don't run the interior fan with this resistor out of the housing, it needs air from the interior fan motor flowing over it to keep it cool.