Samsung fridge ice maker repair tray rotating issue

Hi, new to the forum but hoping you can help with a repair I am doing. The circuit board comes from the ice making machine in a Samsung fridge. There is a small motor that rotates the ice cube tray once they have been created so that they fall out, then rotates it back so it can be refilled with water. Problem is that the tray is rotating to drop the cubes, but then keeps going (eventually hitting the frame and jamming) and fails to rotate back.
The board seems quite straightforward. There are 2 components on the board. The first is a switch (push to make, release to break). This is a test button, push it and it triggers the tray rotation.
The second is a sensor of some description and it is the component that I think has failed. Looking at the plastic mechanism, there appears to be a small magnet on a plastic arm. That arm runs along a cam on the main shaft of the tray. When rotation is triggered the magnet is moved away from the sensor and the shaft rotates. The shaft continues to turn until the the arm passes the cam, then it moves back, bringing it back next to the sensor. The sensor has three legs. I’m guessing that when the magnet moves away from the sensor it switches one circuit to trigger the start of the rotation. Then when it comes back near it again it switches the other way triggering the counter rotation. I have added a few images.
I tried using my meter set on 2k ohms to test any continuity between the 3 legs and there was none. I then tried again with the magnet present, but no change.
Can anyone tell me if my thinking is accurate, how I could test the sensor to see if it’s working properly.

I can’t  seem to find a way to add photos of the numbers on the sensor.

I think it is a Hall effect sensor.
Code on top line is difficult to see but looks like W50B
Bottom line is readable 12U3

If anyone can tell me where I could test it or get an equivalent replacement that would be fantastic.