Water leak

[ffgb]

After a very light rain storm, i noticed water dripping from the upper top area of the inner A-post. The water was actually coming from in between the A-post interior moulding and the windshield gasket. Can this be a bad windshield gasket? Can this be the sunroof drains? How do I remove the A-post moulding trim?
This has never happened before after car washes and heavy rain storms, weird that it happened during a light sprinkle.

Thanks!