Its worth checking the hoses from your power steering pump that run down the front of the gearbox, if they've fallen off their bracket they can wear a big fat juicy hole in the pipe and pump the steering juice out at a rate of knots.
Ever tried steering 1300 kilos without power steering, marvellous!!
IT DOES NOT HAVE A BLEED VALVE, IT IS IMPOSIBLE TO BLEED COMPLETELY THE SYSTEM, SO YOUY HAVE TO TAKE OFF THE FLUID FROM THE TANK AND REFILL IT WITH A NEW ONE OF A GOOD MAKER, YOU NEED 500 CC.
DOING THIS YOU ARE SURE THAT THE FLUID IS ALMOST NEW, BUT YOU CANT BLEED ALL THE SYSTEM