Water Leaks

[fpzjr]

I have a 2003 Ford Explorer Sport XLT and have had nothing but problems. The latest is a leak somewhere. My Drivers side "A" and "B" post/headliner become drenched when it rains. I have a factory installed moonroof. But I can't tell where the water is coming from

Has this happened to anyone else? IF so, how serious and expensive to fix. Any info provided would be greatly appreciated.

Thanks