The evaporator was completely iced up and not allowing airflow to get into the fridge. I defrosted the evaporator and did a force defrost mode to test the heating element and the power coming down to it and it turned on with the forced defrost indicating there is a faulty defrost thermistor that was not sending a signal to the control board to turn on the heater. This unit had an option for a timed defrost mode which bypasses the thermistor and defrosts the unit every 8 hours regardless so I set it two times defrost and instructed the customer to monitor

Replaced control board and valve and tested unit

Replaced drain hoses and tested. Unit drains properly

Replaced sump and tested

"Sump motor seized, needs new sump; ordrng 1 W11613479 (Sump assy)"