Good afternoon and thanks for posting!
Since the unit is filling with water and it seems like you've cleaned out the spray arms, I think you can rule out the water valve and the arms themselves as being the issue.
I would recommend checking the Circulation Pump
as this could be the cause of these symptoms. I was able to find this information about the pump :
The circulation pump uses a motor and impeller to force water up through the wash arms. If the circulation pump is defective, the dishes won’t be cleaned properly. If the motor isn’t making any noise or is just making a humming sound after the dishwasher has filled, the motor may be burned out. First, ensure that power is getting to the motor. Second, to ensure that the impeller can turn, check the pump housing for debris. If power is getting to the motor and the pump is clear of debris, the motor might need to be replaced.
The replacement pump listed for your appliance is MFG part # WD26X23258.