Unplugged driver sunroof drain
 

So I have been having a problem with wet floors for awhile now. I took of a-piller and when put water down the front left drain it began leaking down the a-pillar and not through the hose. I'm thinking that the sunroof drain is unplugged and I was wondering how difficultly would be to reconnect the hose and if anyone has some instructions on that please.

Thanks,
Aron