I have a Norcold and the freezer door sagged and needed a slight nudge to make sure it closed properly. Occasionally it would open slightly, unnoticed, if the bottom main door was closed quickly.

I searched for solutions and most advice was to install washers on the hinge bolts to raise the door. In my opinion, this just raises a sagging door. The door still droops on the opening edge, it's just higher.

Instead I placed a spacer on the upper hinge mounting bracket at the inside bolt hole, NOT on the hinge pin. This had the effect of pulling the upper hinge left, raising the drooping door to a perfect horizontal. I didn't have proper washers handy but a small brass nut has proved the concept perfectly. The freezer door closes perfectly now. I just need to replace the temporary nut with a couple of small washers.