Can anyone tell me where the rear sunroof drain tubes are supposed to drain water to in a 2010 Clubman S?

I've spent a few hours looking for this information and can't seem to find it anywhere. The hatchback appears to have rubber grommets near the rear hatch where the drain exits, but the clubman doesn't seem to have that.

I'm having a number of problems with my car, and my local dealer did a diagnosis and thinks the sunroof drains are clogged, causing water to collect in the floors and causing the FRM module to behave strangely.

I think a bottle of water leaked in the back seat floor mat causing the water in the floor, but I'm trying to check if any of the sunroof drains are actually clogged. The front two seem to be fine, and the back two appear to drain from behind a panel behind the barn doors, outside the door seal. The water seems to run down the outside of the rear door frame (near the tail lights), under the bottom edge of the barn doors and over the rear bumper. Does that sound like the correct behavior?

Any guidance would be appreciated, and I'll see if I can get a picture.