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Happened to a number of people, the bungs by the tailgate hinges can be prone to letting water through apparantly. I also believe earlier models had poor welding on the tailgate that could cause water ingress.
Rear taillights could let water in if the seal is not on correctly, also water has been known to get through the high level brake light. I have also read that it is possible for water to get in from behind the number plate and under the rear bumper. You could take the trim off from around the tailgate and get someone to spray the rear of the car whilst you sit in the boot and see if you can spot any water penetration.
Rear taillights could let water in if the seal is not on correctly, also water has been known to get through the high level brake light. I have also read that it is possible for water to get in from behind the number plate and under the rear bumper. You could take the trim off from around the tailgate and get someone to spray the rear of the car whilst you sit in the boot and see if you can spot any water penetration.