refrigerator not cold

I have a frigidaire refrigerator. FGHC2331PFAA The fridge side is not cold and the front door temp reading does not show the correct temp for inside the refrigerator. The freezer size and temp reading is correct. I was told to replace the thermistor and damper. My question is can the damper be bad, if the damper door opens and closes after I take out the refigerator plug and plug it back in? It does not continue to open and close again to cool the refrigerator. Considering the damper door does open when I plug in the refrigerator, does that mean the damper does work? Can it be another part that controls the damper door that went bad? Thank you.Rich