I am probably not the best qualified to reply, but I am told that they don't have any. I am used to those on Toyota's and Mitsi's that have drains going down the 'A' pillar. But the multi aint no Japanese quality motor !!!
But we love them for their innovation don't we ?
I am also told that the only way to fix it is to remove the frame and put sealant under the rubber gasket that is fixed into the steel of the roof. There are still aftermarket sunroof fitters who could do this for you. But if you do it yourself make sure you go to a motor factor and get the black sealant stuff for cars. The usual DIY silicone is corrosive and must not be used. (Remember the smell of vinegar? - that is acid that corrodes into the steel, so be warned!) HTH
cheers
mish