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Long story... Do your research. You can start right here.
http://pub24.bravenet.com/forum/static/show.php?usernum=2036554146&frmid=6&msgid=881259&cmd=show
I do a lot of Cascadia's. Most of the leaks we run into are from either the marker lights or the gasket itself coming loose from the body. If you're having a problem with the actual windshield, try using a soft seal product between the glass and gasket like ADCO WB300.