OK I'm fgoing thru the same issue on my N821 Norcold (2016) w/o a power surge tho. If it is like mine there are two circuit boards, one on the front of the fridge thaqt has the display and switches called the eyebrow panel. And one in the outside access area in a black plastic box. That one has two fuses and if you are lucky one of those is blown. So check that out first thing.
I still have not fixed mine, after possibly eliminating all else it seemed to be the eyebrow panel but I ordered one from Amazon and it does not fix the fridge. Some I'm still stumped. That was $160 but is returnable.
There are other possibilities so let us know if it is not the fuses.