My front two were just clogged and it caused the water overfill and collect over the light assembly. My wife called me to tell me when she got wet after hitting the gas and the water came rolling out on her lap
What I did to confirm it was the drains. I parked the car where the rear was at an incline. Then I opened the sunroof and poured water from a gallon jug in the area around the drain holes. It filled up and didn't drain. To clear mine I used my air compressor and blew air down both front drains, it cleared them and no more leaks.