Where are the Sunroof Drain Holes

[Todds528ibmw]

Hi,

I have a 2000 528. I put the sunroof back to see if my drain holes are clogged, but I can't find the holes? Are they at the front or at the back.

Can you actually see them? Where exactly are these holes?

Also, is the best way to test them to pour a bucket of water over a closed sunroof and see if it drains out the bottom of the car?

Thanks,
Todd