The drain tube for for the defrost cycle seemed to be blocked, so I googled the repair & it sent me to AppliancePartsPros. Obviously, there's a design problem with this model since many other people have the same issue. This tube is an upgrade on the original for my KitchenAid model (design flaw). Since installation 4 days ago, I have had no leaks - awesome!
The video for installation of the new tube on AppliancePartsPros was excellent. Two additions to the video:
1) I used a hair dryer instead of a heat gun cuz hair dryer won't melt the plastic - I let the hair dryer run for about 15 mins on high heat while I took apart the back.
2) Getting the old tube off - there is a tab from the drain pan that clips into the old tube. I found the best way to get the tab out (without breaking it off) was to pull the base of the old tube toward the tab while pulling the tube up. I had to muscle it off. The new tube went on perfectly & very easily.
The actual repair took about 30 mins from removing the back,removing the drain tube & installing the new one. However the entire operation took me about 6 hours and it included emptying out the fridge & freezer of all food, pulling out the fridge (it's "built-in" surrounded tightly by cabinets), cleaning the entire outside & inside, removing & washing all shelves & drawers, and cleaning the floor & cabinets while the fridge was out.
This is the second time in two weeks I've ordered parts from AppliancePartsPros & both times the parts came earlier than I expected. I received this part the day after I ordered it & I only paid $10 for the middle-tier delivery (not overnight). The Order confirm stated that I would get the part next day & that's exactly what happened.
I'm very happy with being able to find the right part, getting it quickly and finding the tutorial video about how to fix the fridge. It saved me at least $100 on a service call.