Product review (5 stars): Fixed the problem at a very low cost.
The evaporator coil had iced up and I was getting water pooling under the crisper drawers so I went on YouTube to watch a couple of videos to see how to replace the defrost sensor.  I replaced it with this sensor.  While I had the cover off the evaporator coil I put a copper wire around the defrost tube and down the drip tray drain hole as shown in some other videos to keep it from icing up.  No more problems after these fixes and I saved a few hundred dollars in the process.  My wife was so impressed I didn't hire the guy and did it myself.