Have a GE freezer that uses a reversing valve that defrost it.It has froze up the coils in the back.The model # is ca376xb w.....sn..sx100479.i would love to have a diagram to see what makes it work.haven't found power on the reversing coil while it was running..don't want to let it go if i can still buy a part for this old work horse...any help would be great...danny