The grid has been vacuumed on a regular basis. Is that what you mean by the condenser coils?
I don't know about the light question. Could you explain that? I know that the lights always work. A fan runs even when the compressor does not and the refrigerator stops cooling.
I am a neophyte with this. To replace the Control fzr and the defrost timer, I assume that requires accessing the refrigerator from the back. Right?
Thanks for your help.