Norcold Fridge Freezer getting to cold

[crash999]

Yes our Norcold Fridge Freezer is getting to cold.I've just installed the Snip the Tip fix but its still wanting to take the fridge below zero freezing the contents.
I have even tried fixing this unit to the fins in desperation but it still gets to cold.
The only thing I can think is that the circuit board is faulty?
Any ideas?
Thanks

[03Roadking]

Please clarify a couple of things.
#1. What is the "Snip the Tip Fix"?
#2. Is the lower part of the unit what's below freezing or the upper or both?

[Dr. D]

Sorry but it should be "too cold".