Confirmed, D800 LF problem cannot be fixed.

Maybe it is Nikon Mississauga. I once damaged a 18-105mm lens. I bumped it quite hard. It worked but there was huge astigmatism which was very obvious in night photography. They said it is fully repairable and provided a quotation. They replaced lots of parts, and provided a general service. The first picture I took afterwards showed the same huge astigmatism. To make matters worse the VR, which was working fine when I sent it off to them, started working intermittently I had to buy a new lens. I am sure others would have had good experiences with them. That was my second bad experience with them. I don't want to pull down the professional people working at Nikon Mississauga. However, I am convinced that there are/were some working there who really don't care about "Nikon Quality."