Frost buildup in ice dispenser

We have a Kenmore Cold Spot 59592990 side by side refrigerator/freezer. It's been extremely ok. Much of the workmanship is disappointing, but it has met our needs. Recently, the ice dispenser has been causing problems. The bottom of the freezer-part-dispenser (the part that feeds the ice to the door-part-dispenser) gets a coating of frost (thick-type frost), as does the top of the door-part-dispenser. The frost accumulates inside the freezer (door-part) dispenser to the point where it blocks ice from being dispensed. Then we open up the door and the blocked ice spills all over the place. As far as we can tell, the freezer door closes properly, and we're not seeing any obvious gaps in the dispenser tube/flap (obviously, I'm not a real technical person when it comes to refrigerators, so I hope I'm painting a clear enough picture). Do we need a repair person, or is there something we can try ourselves? Thanks very much.
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Your friend in need could be online at www.repairclinic.com. Smart people, lots of parts, good prices and quick shipping. Might be help at Sears, too; they are doing a lot of DIY parts servicing. Good luck.
Joe
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Joe, thanks very much for the reply - I've contacted repairclinic.com through their website.
Mark
Joe wrote:

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Ours had frost, but not so heavy. The flap on the ice despenser (where the ice comes out) looked like it was sealed tight, but I removed and reinstalled it and all was well. Guess it doesn't take much of a leak for frost to form in hot weather,
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