The front left sunroof drain on my 81 300D has rusted out and water drips into the car every time it rains. I slid new plastic tubing down the line until it protruded from the opening in the door frame, sealed it in place with a beveled rubber washer and silicon, packed the whole area with plumber's epoxy and it still leaks. I've seen posts about similar problems and the answers alway begin with "pull out the headliner..." Fine. How do you remove the headliner? I can't figure it out at all.