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The spray arm on every dishwasher is loose except for Bosche, the water pressure holds it up and firmly seats it on a split washer.
A chugga chugga noise usually is asociated with no, or little, water in the dishwasher.
Try a new cycle and see if it fills up to the bottom of the Heater, if not , you may need a new water inlet valve.
Hope that helps!
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