Autopopulated combobox value passed to definition query - results won't display on map

I have a dojo combobox that is populated with unique values. The user chooses a value, and the value is passed to a definition query, and the results displayed on the map. I can't get the results to display once the value is chosen from the combobox.

I"m pretty sure I'm not passing the value from the combobox to the definition query correctly, but not exactly sure where it goes wrong.

Here is my code http://ift.tt/1E1bI3E