SMV50C10GB/46. Z-NR 00332. FD 9612. S16PIB. No movement of upper spray arm, bottom one is ok. I have removed the ducting from the base and no water is being pumped from the bottom. My job is washing machines so I have no experience with dishwashers and I am trying to help a friend. I assume it is two outlets from one pump. Any advice gratefully received.