When I bought this car, the headliner would start to feel wet after it rains. I did research and found out it could be the drain tubes from the sunroof. So I took apart the interior trying to see if I could fix this problem, but when I got to the sunroof there were no drain tubes. Is this a common problem or is my car sunroof aftermarket and they just didn't put in drain tubes? If someone can help me with this, it would be appreciated.