DeGi90

Hi All, can someone point me in the right direction!? the fan on my 2007 defender (Puma) just stopped working on speeds 1 and 2, and only works on full speed on the 3 setting. I understand that this means that the resistor is shot. does anyone know where this is located? And what part number it is? (though i can read the part number from it once i locate it!) Regards Mark