I have been waiting for one of these to take pics for this job - Maytag bottom freezer - drain tube iced up - pain in ass usually to fix and take apart - unless you use my easy method I developed for this job.
I used to hate doing these, getting the back panel off such a pain and time consuming. Well, here is how I do it the easy way -----------
First, I remove the freezer door, and both racks. I use my steamer to clear out the ice, and have my wet vac on hand to suck up the water. Then, I start to steam the drain pan and drain hole without removing the back. Using the attachments shown, I first steam out the ice along the bottom of the back evap cover. I concentrate on the center where drain is, then bend up the center with my needlenose pliers. It gives me just enough room to get my wet vac hose attachment into drain. I leave it run while steaming the ice in pan, sucking up the water. Then, I attach the steamer attachment with the 1/4 hose, and insert into drain hole, clearing it.
Big problem used to be the sealed tank would get full, and you would be back in a few days with same problem. Once I clear hole, and blast with steam, I insert the vac hose into tank and it drains it. Beautiful part is you don't have to remove the back and it saves a lot of time.
That little vac attachment works well to drain a standard pan underneath refrigerator if it is full also. Steamer attachment works also to clear gunk on a pressure switch dome if it is really gunked up. Stick it on and blast with steam.
Hope this helps some of you if you decide to try this. It works well for me.