Agree with statements above. For reference our 1350 is in a slide & has two fans as referenced by Doug. We routinely get the main box down to 35f and often go back to a setting of 3. Lettuce freezes in the crisper. If it's in the mid 90's outdoors then we only get to 38 or 39f. In addition to suggestions above, you could check the door seals. We have developed the habit of always closing the left door 1st, making sure the 'flap' closes properly.
Hungry grandkids also have a negative impact. They like to hang with the door open while staring at the tv....
