Had a look at my 850 this morning and the front drain points can easily be seen with the sunroof open. I've not checked where they exit so you will have to investigate that yourself.
Be very careful if you decide to poke the drain with a piece of wire (or similar) as it is possible to dislodge the tube and would be a nightmare to refit
Can't see the rear drain at the top but as I mentioned yesterday they do exit at the rear of the wheel arches. If you lift out the spare wheel floor cover and the side floor on each side you will see a black tube which goes into a plastic box before exiting through the floor to the outside. Make sure they are connected properly and the tube is still going to the outside
If you look underneath the car behind the back wheel you will see the point where the rear water drain exits the car, make sure it is clean as they can get bunged up with mud from the back wheels
