Copied from a PM (just something to add):
Also, on watching for the leak during a rain storm.....make sure the car is dry on the inside of the headliner before the rain starts. then get in there EARLY or immediately after the rain starts.
The idea is that you want to visually locate THE FIRST DROP as it enters the car. That will indicate the direction from which the rain is entering....
Recognize that the center point of the roof/windshiled is the roof's highest point. The drip will enter the car anywhere downward from that center point.
The first possible entrance location (from the car's center) is the screw hole for the targa "eyebrow" assembly.
The next possible entrance point is the gutter system where it connects to the drain hose.
So, locating THE FIRST drop is part of the trick to nailing the leak and fixing it with the rest of my thread's info.
But then again, my thread's info is written to knock out all of the entrance points anyway.