My Samsung fridge model RS2556SH is only 3 years old and I am having problems with it cooling the fridge part, the freezer seems to be freezing okay. I took the back pain off the freezer and the evaporator coils are frozen. Do I let these defrost? Will that help the fridge cool again? Any help is appreciated. Thank you.

My Samsung fridge model RS2556SH is only 3 years old and I am having problems with it cooling the fridge part, the freezer seems to be freezing okay. I took the back pain off the freezer and the evaporator coils are frozen. Do I let these defrost? Will that help the fridge cool again? Any help is appreciated. Thank you.
Check the timer(or defrost relay) and defrost heater... when 1 of these components fail the evap would freeze... this information applied to most fridges