Kitchenaid Top rack not cleaning dishes

Can you please help,
My kitchenaid dishwasher model # kudr24sewh3
is not cleaning the dishes on the top rack

I replaced the middle spray arm tube kit
which did very little help

Im sure there is no blockages in the tube assemblies

I read another post about a different brand, You sad to clean the screen unit, which clogs up.
I looked for the same sreen on my Kitchenaid to no avail.

Can you please help?