Amana refrigerator problem

I have been having a problem with my 9 year old Amana refrigerator. For the past few months, condensation has been forming on the top front of the inside of the fridge. It sounds like it might be a clogged defrost drain tube. Can you tell me where the drain tube is located? Is it possible to try to unfreeze/unclog it without taking anything apart? It looks like there is a tube opening in the right freezer vent (the one in the front of the freezer when you open the door). I currently have it unplugged for cleaning and a quick response would be appreciated if possible!
Thank you!