Dishwasher Spare Parts

Hello, i have a bloomberg dishwasher and i am very pleased with it.
now, though, i need a spare part for it, namely electrical valve for the sprinklers,
because the machine is not working properly.
it only sprinkles water from the bottom sprinkler, and the top one is not functioning.
so, please, if you can help me and tell me where can i buy this spare part from.
thank you in advance.