That would be the most obvious leak. There is no other place where coolant enters the interior.
The only other possibility is coolant migration. Go to 1000q the FAQ section and search for coolant migration. Basically, a defective coolant tank lets coolant enter the wiring harness which migrates through it. The 2006 has a different style of plug which should prevent this problem though. See the FAQ article on how to check it and pics.
The only other possibility is coolant migration. Go to 1000q the FAQ section and search for coolant migration. Basically, a defective coolant tank lets coolant enter the wiring harness which migrates through it. The 2006 has a different style of plug which should prevent this problem though. See the FAQ article on how to check it and pics.