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Hello , if those vents are frosted up your fridge has a defrost issue , its supposed to defrost 2-3 times a day ..it will be one of 3 thngs the main control board ,heater or defrost thermostat ..it does require removing the drawer ,rear panel,and getting to that coil that is frosted up to check for defective parts ,you can check the heater and thermostat with a meter ,for continuity,if you have a meter ? if those are good then change the board
this is also the reason the ice cream is not as hard , the excess fost stops the air flow and affects the temps ..
it is a bit of work to get in there..if you leave it off and let it defrost it will work again but only for a week or two ,then do it again