Having the same Norcold - or more lovingly called Nevercold - it sounds like your cooling unit has failed.
We have had 2 cooling units fail on us.
What is happening with your unit is exactly the same it was with ours when it failed. Temps not where they should be. Fans not running.
The 1st one failed in February of 2015. Thankfully our extended warranty covered it and we were only out the $100 deductible.
The 2nd one failed in January of 2016. This was within the 1 year Thetford warranty. After much arguing with Thetford they finally agreed to send us a new cooling unit. Again the extended warranty paid the labor to replace it.
If this is the first time the unit has failed on your rig you have had greater luck than most.
Replacing the cooling unit is not cheap. Both of ours were around $2,200.00 each.
Depending on the usage of your coach, i.e. full timer, winter only, occasionally, you might want to think about looking into a residential fridge. We will be installing one the next time anything goes wrong on our fridge.
One thing to try is testing the thermister. You need to have an ohm meter for this.To do this you need to take the thermister out of the fridge. Put the clip end in a cup of ice water. Put the ohn meter clips on the other ends of the thermister. The Norcold website will tell you how many ohms of resistance it should have depending on your make and model of the fridge. If it is within range then the thermister is fine. Then leave the thermister out of the fridge for a while. If cooling improves with it out then it is likely the thermister.
No matter what - it is very aggravating to have fridge issues.