I have a Kitchenaid Superba fridge that's around 10 years old and came with the house when we bought it. We frequently had to dump all the ice because the drip tray of the dispenser kept flooding. I searched everywhere to figure out the problem and finally found the answer when watching the video on this site. Indeed it was the "flapper" of the ice dispenser that was the culprit - the foam behind it was entirely corroded, not sealing the door properly and letting in warm air. This would thaw the ice at the bottom, causing the drip, and then the ice would refreeze into one giant blog so that the dispenser would no longer work.
I'm not skilled in these kinds of repairs at all. My husband refused to touch it. But the video was so straightforward, I decided to brave it. It worked just like instructed. The new flap arrived the next day after ordering. The repair took me about 45 minutes and since then the drip tray has been entirely dry, which hasn't been the case in 3 years! I then soaked the trip tray in some vinegar to get rid of the ugly scale buildup from all the dripping, and it even looks much nicer now.
It's very rare these projects work out on first try like this, so I'm super happy. The only downside might be that from now on I'll be in charge of all home repairs around here.