Blocked Drain in soft top storage compartment C70 - 2003
 

I could hear water sloshing about in the roof storage compartment the other day. After driving for a while it stopped and I thought no more about it until I checked it today after rain. Water is collecting in the compartment and the (2?) drains on the passenger side are blocked.

I could not see any obvious way to remove the top drain cover or how to access it underneath.

I have 2 questions:

1) Has anyone got any knowledge on this blocked drain issue?

2) Does the fact water is collecting in the compartment mean I need to replace the seals on the cover?

All help greatly appreciated!