My fridge temp is around 40-43 degrees, with the air damper opened all the way open, and the thermostat turned all the way cold. The fridge seems to run properly - cycles on and off, all fans work, compressor kicks on and off, etc. Definitely not a problem with the light staying on inside the box.
So, I spent some time here:
and decided to get a look at that evaporator coil. I'll tell you, on this model of fridge, it was a royal pain, because once all the screws and tabs were released from the rear panel, it was still held in place by a plastic grid on the left side that directs airflow near the ice cube trays. Until I figured out how that thing snapped in place and got it released with a screwdriver, it was tough going. It snaps through the metal panel into a square air duct behind the panel, and the tabs are in the 9 o'clock and the 3 o'clock positions.
Anyway, I snapped a picture of the coil and attached it here. I don't think I have an evap coil problem, but please correct me o master for I am not worthy. I definitely don't have an iceball, and it's not frosted closed. So I don't think replacing the defroster or the bi-metal switch will help me... any suggestions?