GE SXS built in refrigerator Model # ZISB48DYA, evaporator is up in the ceiling of the freezer compartment and to get to it you must remove 4 panels and a million screws. then it's got a styrafoam block under the evaporator with a metal drain pan attached to it. Defrost thermostat is all the way in the back of the evaporator along with the evaporator fan delay thermostat, To replace the defrost thermostat and the defrost heater you practically have to stand in the freezer compartment with your head under the evaporator.
Manually defrosting this unit is a no no. If you aren't using a light wheile you're doing it you can't see what you're doing and if you are, the defrost water is going to land right on your light.
Seriously GE, who the hell puts the evaporator in the ceiling of the freezer compartment? I'd hate to have to do an evaporator replacement on this model, there is no room for your torch.