My '93 RX7 leaks water over the passenger seat when it rains. I'm trying to identify the source.

I understand that there are drains in the tray beneath the sunroof. If blocked, then the water can back up and spill.

I retracted the roof and looked with a flashlight. I can't find any drain openings.

Can anyone explain
- where the drain openings are?
- how many are there?
- any tips on cleaning / flushing them out?

Photo would be great if doable

Thanks - Jim