Frigidaire FDB636GFS5 Uper Spray Arm does NOT Spin

[FONT=‘Times New Roman’,‘serif’][COLOR=#000000]The Spray arm under the top basket does not spin at any time during the wash or rinse cycles. Is there a valve that controls the water flow to the top outlet?[/COLOR][/font]
[FONT=‘Times New Roman’,‘serif’][COLOR=#000000]I have removed and cleaned the filter checked the spray arm to make sure it moves freely. I cannot see if there is water pressure flowing from the top outlet to power the spray arm[/COLOR][/font]

could be the same problem as this thread:
http://forum.appliancepartspros.com/dishwasher-repair/147519-frigidaire-dishwasher-checkball-water-diverter-not-functioning.html