The front drains are accessible with the sunroof slid open, no need to remove the lining. They are holes about 5mm diameter in each of the lower front corners of the roof channel. You can blow some compressed air down them or use a guitar steel string to get down to unclear a blockage. Pour a 100ml or so of water down each drain to test the flow of the drain. The water should pour out freely and quickly from behind the front wheels.
HTH
Myles
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