1999 Sub Zero 650. Has exterior sweating/condensation which has caused mold to grow on the cabinetry, flooring, and on the fridge exterior itself, as well as water dripping from bottom surface area, with some mold in the drip pan as well. The tech told us that this is an issue with the interior insulation and that it is not repairable.

If we clean this constantly can we keep the machine running and use it?

Could we add to or replace insulation or build an insulated cabinet around the refrigerator?

Has anyone ever removed the outside panels and re-insulated a fridge?

Will this problem spread to the insulation between the freezer and refrigerator?

Just trying to see if this fridge is worth keeping by somehow trying to deal with the issue, or if it is best to move on.