Hi,
I think the tube to the drain pan must be clogged because in at back of the fridge at the top I can see where the water drips from the freezer into the tube and the little collector or basin for the water to run into the tube is completely full of water at times. Most of the time the collector does not have any water in it but I have noticed it overflowing a couple times.

The fridge is a Beaumark model #34768-3