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please take the carpet up on the drivers side front and look for the black box . open the box and see if there is moisture there and corrosion .
yes the leak either is the pollen filter housing, the sunroof drains clogged causing the drain to over flow at the connection from the duckbill to drain hose , or the door regulator seals of each door not sealed correctly causing when its raining it bleeds in causing a flood inside the car
did you take the cover off of the black box to see if there was any corrosion?
got it just let me know!!