GE service tech checked the control board and looked at the compressor and relay switch. He says the electrical sound I heard was water hitting the defrost heater. I asked about the burning plastic smell and he said same, just water hitting the heater.
I asked about the howling wind sound and played him this video of what it sounds like https://streamable.com/v7iut
he said he never heard such a sound. Of course, as soon as he left, my fridge resumed making the howling wind sound, which it hasn't done in days.
I asked why my fridge ices over if I put large items on the top shelf and he said it's normal.
Tech says my fridge is fine. I asked if it was ok to buy groceries and he said go for it.
I was not charged for the diagnosis, thanks to GE support.