Freezer is too cold - Refrigerator Warm.

I replaced the Defrost Timer.
The cooling coils are free of frost and the small fan is working.
I cleaned the condenser coils underneath which were covered with years of dog hair and dust, etc. I think that was my major problem.
The condenser fan seems to be operating fine. I will keep an eye on it.

My side-by-side is working better now. The super-hot "Yoder Loop" is not hot anymore.

However, the Freezer is still -10 degrees at its warmest setting, and the Frig is good but set near its coldest setting.
Air is moving from the freezer to the Frig side.

1) Do I need a new Thermostat? Is that the same thing as the Refrigerator Control?
2) Will I harm anything if I keep the unit running as it is now?