I was just about to put the interior back in the car after repairing the leaking sunroof drain tubes, and heater valve, when I thought it would be a good idea to make sure the drain tubes were working.

I poured water into the passengers side corner of the sunroof where to drain was, and found water pouring out of the bottom of the A pillar finisher and from a corner of the headlining were the passenger sun visor is.

I'm fully prepared to be removing the headlining, but and idea of what I should be looking for as an obvious leaking point would be useful.