Refrigerator side is not cooling enough. Temperature is only in low 50's. Freezer side seems to be okay.

First thing to try is Powering off the FF at the mains supply and leaving it standing for 30 minutes. Make sure that you do not open any of the doors or touch any of the controls during this time. Then reconnect the power and wait for 30 to 60 minutes to see if the fault remains or is cured. Try completely defrosting the FF as despite common belief these units are not totally frost free.

In side by sides if the freezer side is working OK and the fridge side is not working correctly it means that air ducting has iced up or the air vent from the freezing unit to the fridge compartment has stuck in the closed or partially closed position which causes the fridge to not be any where near as cool as it should be. If it is too cold then the vent is stuck in the open position and the fridge temperature will continue to fall and become the same as the freezer, thereby freezing the contents of the fridge compartment. It can also get stuck in another position so that if the temperature is adjusted on the front panel then nothing happens to the temperature in the fridge compartment. The vent, which is usually at the top of the fridge compartment on the side where it joins the freezer compartment, is controlled by a small sync motor and either the motor has become faulty, the control module is faulty or the vent is iced up. It can be come iced up by putting too many hot items in the fridge so the steam condenses and freezes the vent in position and then the motor cannot open or close it causing it and / or the control module to become faulty. Other times it is just old age that causes the motor and / or the control module to fail. If the sync motor and vent are working OK then there may be a fault with the fridge temperature sensor or main on board controller that will mean that the sensor or the controller will need replacing.