Ice maker tray is not filling with water. Kenmore Coldspot 7762790?

I have a Kenmore Coldspot Model 7762790. The problem is very recent. We discovered the icemaker was not making any more ice. the armiture is down and has been working fine until recently discovered the ice bin empty. Evidently the ice tray is not getting any water. The water supply is fine. The water dispenser on the door is working properly. The ice maker appears to be going through the motions of dispensing the ice (that isn't there). I suspect it may be some sensor or relay that is not working to dispense the water when the tray is empty. Which relay or sensor is it and where is it? can that be replaced?