Sun roof drain causing leaks on a 99 lrd2

[bsa239]

I have a 99 lrd2 with 152,000 miles, from what i have read, the sun roof drains maybe blocked. I get water running from the rear sun roof and am wondering how to unblock the drains for both sun roofs. I have the service manual and it shows how to remove the glass and frames, but does not show the routing of the drains.
Any help or ideas is appreciated.

Bsa239, mike

 

[piedmontrover]

If you can find where the drain lines exit in the rear quarter panel you can blow comressed air back up into the drain pain to see if the line is blocked