Icemaker quit working

I removed the 3 screws that held the unit in place and disconnected the power supply from the front part of the icemaker. I then assembled the replacement icemaker and plugged it in to power supply. I then mounted it with the 3 screws that it required. (Tip): Note the top 2 screws do not need to be totally removed just loosen them enough to remove icemaker. I then cycled the iemaker shutoff arm several times and within 45 minutes I had my first ice cubes