As said there are plenty of reports of leaks in different areas of the route the rear washer tube takes but if it is leaking straight through into the boot from the motor then it is most likely the ridgid plastic tube in the rotating spindle has sheared. You need to fix it or stop using it or it could eventually knacker your boot central locking.
I had the same happen and being tight there was no way I was paying £30 ish for the repair kit which consists of a short plastic tube and a rubber gasket. £60 for a complete motor is better value TBH.
DIY method which so far is fine and cost me nothing.
1. Remove rear lights to
help get to rear boot panel clips and carfully remove the panel.
2. Remove wiper arm
3. Remove wiper motor and disconect feed tube
4. Pull off small squirter nozzel part on end of the broken plastic tube and
store safely and remove remains of the broken plastic tube.
5. Acquire a length of small dia flexible tube such as RC car fuel hose with an outside dia of no more than 5mm.
6. You may have to carefully drill through the metal spindle that has the threaded end that holds your arm on so the tube can be fed all the way through.
7. Refit motor.
8 Connect your fuel tube to the existing feed tube with a small in line connector ( I used a micro gardening watering system one I had lying around)
9. Feed fuel tube up through drilled out spindle.
10. Carfully superglue the small spray nozzel into end of fuel tube without blocking the feed holes and allow to dry.
11. Push spray nozzel back down into spindle (it should be a snug fit as you don't want it to rotate on it's own as it will now rotate with the spindle)
12. Refit internal trim, lights and wiper arm.
13. Adjust by rotating the snug fit nozzel so it lines up with slot in arm cover cap.
14. Done.
Takes about 60 mins and a little thought but it seems to work fine.
I take no responsability if you have go at this.
