55 reg 2.0 fsi rear wash/wipe u/s.wiper motor has pushed itself apart,presumably siezed in the wheel box.fuses all checked,plugged in a new one,nothing doing.rear washer squirts when the front is actuated,but not when stalk is pushed for rear washer.in the rear wiper plug ALL of the terminals are live,exept the earth.I've checked the wires in the rear hatch for fraying,etc & all is good.Audi say they 'they don't sell stalks',as in there is all but zero stock movement, but I'm short of ideas.Also looking at the stalk,how does it come off?