Did your fridge just quit? Did you smell ammonia.
Are you sure that the fridge is dead, and why do you feel this to be true
I have a 1985 and my fridge didn't work when I bought it.
It needed a new coolant unit. Not a hard job but new to me. Didn't work at the very first start up, but leveled it well and it now works excellent.
These ammonia units a very critical in having it properly level to function.
If you didn't smell ammonia, I would level it perfectly and try it again. It takes quite awhile for the cooling to happen. Use the 120v option for power to fridge.
A good temp sensor is great info.
I use a 2' level right in front of the fridge. L to R then front to back. A small level makes it harder to get perfect, and may lie!
If you do need to replace the cooling unit ATCO has my vote.
hth
steve