My ice maker is not cyclying. If I put pressure on the small white cog with a small screwdriver, it will move just a short way. It will not complete the cycle. I have replaced the water valve, and have a good flow of water. If I keep slight steady pressure on the small white cog with a screwdriver, it will cycle through, but as soon as I release the pressure, the cycle stops. Is there something in the control unit that can be replaced to repair the ice maker?