I have a kenmore elite ultra wash dishwasher quiet guard 7 with the turbo wash. The middle spray arm has stopped spinning. I changed the feed tube going up to the arm, but to no avail. The feeder tube assemble didn't come with the Turbo section. I checked the water level and it seems adequate and I don't know how I can check the rpoessure from the pump, but it is enough to run the bottom spray arm. Any suggestions what could be wrong?

Sure. Take a rounded toothpick and clean every one of the spray holes in this arm and unclog the ones that are clogged up. Happens all the time with little pieces of food such as rice, etc. Everything should work just jim dandy after this procedure.