Kenmore is a popular appliance brand commonly sold by Sears, but Sears does not manufacture any of the appliances themselves. Instead, they source that out and have other manufacturers make their appliances for them. Kenmore refrigerators are made by a variety of different manufacturers including LG, Electrolux, GE, and Whirlpool.
Please verify the model number of the refrigerator as I can't find any information on models beginning with 795 72312?
Where is the ice build up occurring?
If it the freezer compartment it's sounding like a defrost problem - heater, thermostat, blocked drain, timer (or control board)
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