First, I unplugged the fridge.Here you can use this service manual:
Thanks for this service manual. It's very helpful.
from the inside? If so, how did you open it? Could you share?
In order to access the heating element and sensor, I had to remove the freezer door and trays.
This video explains how to remove freezer door
Once that was out of the way, I removed the ice maker. There were 2 screws holding up the front and the rear hooks onto a couple plastic pieces mounted to the top of the freezer. After I removed the front screws, I was able to unplug the ice maker and remove it.
The back panel was held in with 2 screws in each upper corner. I removed the small plastic covers to access the screws. The bottom of panel was tucked in behind the plastic. Once the screws were removed, I gently pulled on the top of the panel to try and get a finger behind it to pull it towards me. I almost pulled too hard and cracked the bottom of the panel. This was the hardest part, because there isn't much room to work.
After I was able to get it loose, I had to disconnect a connector for the fan that is attached to the back of the panel. Again, not much room to get my hand behind it. After the connector was disconnected, I was able to completely remove the panel and see what I was working with.
As you can see from the attached image, it was frozen.