Yes, looks like your defrost drain line/drain hole is clogged up, not allowing the defrost drain water to drain into your drain pan underneath the refrigerator.
Here's your parts diagram:
Parts for GE GFE28GSKBSS: Fresh Food Section Parts
#730 is your drain trough, see the hole in the middle of it? That's the drain hole.
#712 is your Refrigerator Evaporator Fan Motor, when you click on that link you will see a video of how to remove the back panel inside the refrigerator section to access the drain hole.
You will need to get a hair dryer to melt the ice, then run some hot water down your defrost drain hole, if it doesn't go down fast, its clogged, then you would need to use air pressure to blow out the drain line, or get a mini-snake to run down it.
I use a evaporator cooler spider snake:
Evaporative Cooler Flexible Spider Snake
They are used basically in Arizona to clean out the water pump tubes that run to the cooler pads. I don't know if they would sell them in your area, but if you go to your local hardware store, they should have something similar to run down your drain to clean it completely out.
If it still won't drain down to the drain pan, then its possibly your drain tube is clogging up, its located behind the refrigerator, I'd take the drain tube off and check it for debris.
Here's the drain tube for your model:
DRAIN TUBE AND VALVE WR02X28554 / AP6280564 made by GE
click.linksynergy.com
Here's a photo of it:
I located a video too: