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Hi I will be glad to help. You have done some good work and it sounds like you are not getting full pressure to your top of your sprayer on your dishwasher. If setting a glass in the top rack front corner and the water does not fill it then you may need to clean out the sump assembly and water supply tube and check for any blockage. Then give t another try with the glass test.
What you need to do is pull lower and upper rack completely out and set aside for now. The sump assembly will be below the filter cover that is accessible from the inside. Make sure it is completely free of any debris. Also check the supply tube for any debris.
Ok let me know if you have any other questions.
That might be the best thing to do. A good qualified technician should be able to handle the issues. Thanks