Question about Frigidaire 24 in. FDBB945DC Stainless Steel Built-in Dishwasher

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Hello, top washer arm does not work on a frigidair dishwasher. Took it entirely apart, tested the main pump (it worked), and no clogs in the tube going up the side to the upper arm. I have determined it is the ball valve in the main body. When the pump comes on, it slams the ball into the gap, closing it to the top washing arm. BUT it worked at some point before this! I can't figure it out and it is driving me nuts. No clogs, no broken parts, lower washer arm works fine. I cannot figure out how the ball is suppose to stay out of that space so that water can travel to the upper arm (I understand via the owners manual that the arms alternate, but how, how how??

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