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Good morning. I am Kevin, one of the tech's here on JA.
You explained quite a bit of things related to controls, other than the fan motor wiring. Has anyone looked at the charge or efficiency of the compressor for this unit?
I'm not familiar with this model, but the I replaced a compressor on a Sub Zero, which had 2 compressors, one for freezer, one for refrigerator. I will add though, if it is the refrigerator section where the temp goes up, the compressor could be having a problem starting. this would allow the temperature to climb easily to 50 degrees, but the frozen section will stay frozen for some time.
This is precisely why I ask if the compressor is ok. It could be working fine when the service man gets there and then kicks out at times. Maybe start components?
Same to you Harry. Have a great day and a happy new year.