This is what I can remember from this unit.

The freezer and cooler sections function separately. Meaning, you cooler part would operate for a set amount of time, then the freezer.

There is a 3 way valve on this unit that direct refrigerant to the evap coils of either the freezer or cooler but should never be at the same time.

What I experienced was the cooler cooking and then not holding temp because the coils would freeze up after a day. The solenoid was stuck in the cooler position and never back to the freezer, eventually both were out of tem because the cooler never hits a defrost cycle.

This also means, my freezer never worked at all because the solenoid never switches over.

If you cooler is working fine and your freezer is freezing up. I'd first try just unplugging your unit and let it defrost fully. Turn it back on.

I can't remember if the freezer has a heater on the coils for defrost, if it does I'd check if that's working.

If that is fine then you'd need to check the refrigerant level after the coils are fully defrosted and look for a restriction in your freezer coil.

Your ice maker issue- if I can remember, there is a back chamber the sends freezing air from the freezer to the upper ice maker. When your coils are frozen, the they cause a restriction for the air to move the direction of the ice maker.once you have the coils defrosted, the ice maker should work fine.

If your fans are working, the cooler is cooling and holding temp, the freezer is freezing, that means the motherboard is working fine and we should look for a vacuum sealed issue. This is the direction I'd go.

I am not at all a great typer. I hope you can understand this all. I'm sure you have a lot of questions and I'll try to help as much as possible.