About a month ago the ice maker stopped making (or dumping) ice. What I have noticed is that the ice tray has ice cubes in it, but has not dumped them into the bin (I can reach in and feel the ice in there). Water dispenser works fine. Any idea where to start? Is there a sensor that detects when the ice is ready to dump? Could it be a bad motor that isn't allowing the ice to dump into the tray? Thanks in advance for any help!