Bottom of ice maker is frosted up & leads to food getting frost

Sounds like your freezer is pulling outside air into the freezer from the dispenser door or around the door seals. This could be a defrost problem beginning as this is moisture remaining inside the freezer compartment and not being taken out during defrost. So it may be a good idea to look into the back of the freezer and see if there is frost forming also on the rear wall. If yes you will need to manually defrost by unplugging the refrigerator and removing the rear panel in the back of freezer to expose the evaporator coil. If frozen over I want you to defrost with a hair dryer until we can have a look at the defrost heater below these coils. The heater in your model PSS26MRSS has glass around the heating elements and will be easy to see if the element is burned out. If burned out the defrost heater part number WR51X10055 and the defrost thermostat part number WR50X10068 should be replaced. Let me know if you are ready to begin or if this is helpful. If by chance these 2 parts look OK then we will need to look over the main control board for burn marks or signs of heat damage. I'll be here if you need me Thanks, Sea Breeze

Here is how I fixed mine. Shine a flashlight down the ice shute. There were two rubber flaps....one was up as it should be and the other was down, causing a small crack that was drawing in outside air that in turn, created ice in shute and on bottom of ice maker. Solution was to open door and reach up and manually open flap....work rubber into an up position and then allow flap to close. Check after dispensing ice that both flaps remain in the correct position.