Ice Maker not making ice

I have a 9 year old Kenmore Elite Side by Side Refrigerator/Freezer Model 106.50503990.
Recently it stopped producing ice. You can hear the tray try to drop ice but there is none because the tray does not fill with water. It goes through the process over and over again but no ice. We get water to dispense but no ice forms. I pulled out the unit and checked all tubing. It is not bent or crimped. I took the tubing off and it appears fine. I suspected ice stuck in there but that was not the case. Any suggestions?