Samsung not cooling. Reached dead end on troubleshooting...

I’ve had lots of problems with my fridge and while it was still covered under warranty a few months ago had the compressor, fridge evaporator assembly and PCB all replaced. It recently stopped cooling again.

The fridge starts to cool and drops 2 degrees in both fridge and freezer, then stops cooling.

Here’s what I know:

  • The compressor runs
  • Both fridge and freezer evaporator fans run
  • The evaporator coils get cold and frost up a little bit.
  • I took resistance measurements of both fridge and freezer heater, bi-metal, and sensors. I can provide those numbers if interested.
  • I cleaned the condenser coils.
  • The self-diagnostics don’t report anything.
  • the light on the inverter is steady, indicating it’s fine.

Help is greatly appreciated!! What am I missing!?!