Thank you for your question.
I am sorry you are having a problem with the refrigerator. I should be able to help you with defrosting the drain tube. First, unplug the refrigerator. Then remove all of the food in the freezer. Next, remove the shelf and icemaker if equipped. Now lift and slide the bottom try out of the freezer. The support for the tray has to come out next. There should be a few screws securing it. Once that is out of the way, remove the screws in the back panel. Then remove the back panel. After the panel is out of the way look below the evaporator coil and you will see all of the ice. Be careful the evaporator is sharp. Use hot water and a turkey baster to melt the ice. Once the ice is melted, you will see the drain hole. Continue to squirt water into the hole until the water flows down to the drain pan in the bottom of the refrigerator.
I found a video that shows the drain hole and water flowing into the pan. Click
to watch the video.
After you have the drain cleared, wipe up all of the water and reassemble the refrigerator.
Please let me know if you need further assistance.
Here is a link to order any parts you need.
Sears Parts Direct
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services
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