LG refrigerator not cooling. The refrigerator section of our 2 year old frost free LG icebeam

Question

The refrigerator section of our 2 year old frost free LG icebeam grs352gca is not cooling. The temperature cannot be adjusted, the LED's show max cooling but it is not cold. All the LEDs are illuminated except for the first LED. The freezer operates 100%. The unit worked for a couple of days after being switched off, but now has returned to the state described above.