Product review (5 stars): Common Samsung French Door Fridge Thermostat Problems
I have a Samsung RF267 series French door fridge with two different issues.  It had the common problem in the top compartment where ice blocked the drain hole so water pooled in the bottom of the Cool Select Pantry.  Additionally, the freezer temperature was set to -2 degrees F and the display showed -2 degrees F.  However, two different mercury thermometers showed the freezer temperature to be colder than -10 degrees F.

Abundant videos online show the fix to the ice drain plug problem.  A DA61-06796A Clip Drain Evaporator attached to the heater element keeps the drain hole from freezing.  The older/short Clip Drain Evaporator is held in place by an aluminum pop rivet.  A small flat head screwdriver can be used to remove the old component.  The root cause of the drain hole freeze problem is the defroster thermocouple.

A thermocouple changes resistance as temperature varies and is the component allowing the computer to tell the temperature.  Two thermocouples were bad, one for the defroster and the other for the freezer compartment.

Per other online sites and Amazon's parts checker, there are three different thermocouples for my model: DA32-10105B, DA32-00006S, and DA32-10105X.  Nowhere does anyone mention which thermocouple goes with which function.  Note that the connectors and wire lengths are different for different models.  DA32-00006S is the defroster thermocouple.  A failure in this component causes the coils to ice up.

DA32-10105X is the refrigerator compartment thermocouple.  It is on the plastic cover that must be removed to access the coils from inside the fridge.

DA32-10105B is the freezer compartment thermocouple.  Again, there is no mention online of where this thermocouple is located.  On the roof the freezer compartment, look past the light fixture towards the back of the freezer.  There is a small vented grill.  This grill holds the freezer thermocouple.  Gently pry it out with a small flathead screwdriver.  You might break a few plastic tabs on the grill.  Only a few intact tabs are needed to keep the thermocouple from falling down.

Unless you're very flexible or are willing to work by feel, it might be advisable to remove the freezer door.  First, remove the Sliding Drawer, the Tilting Basket, and the Main Basket.  Next, take off the freezer door by removing the four hex head screws from the sliding brackets using a 10mm socket and ratchet.  With the door out of the way, it is easy to sit on the floor and access the freezer thermocouple grill.

Once you have your fridge defrosted to replace one thermocouple, you might as well go ahead and replace all three.