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Lower wash arm hits back water feed, noisy

The machine recently started making a loud ticking noise when washing. It appears that the lower wash arm is hitting the back plastic water feed cover. It is like the arms are sitting lower than they used to. I've taken the arms off and nothing seems to be out of place. I'm wondering if some spacer has broken although there are no plastic bits sitting in the bottom. Any suggestions?

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thanks and accept the solution accordingly

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