Upload & Sell: On
Had the same issue with my D700 after conversion to IR. Not sure if it occurred at the conversion or in shipping but returned it to the IR conversion company Life Pixel and had it converted back. Came back with the same issue, called LP, they said they had visually tested it before the shipped it and it was fine.
Took it in to APS and they found that a small piece that adjusted the diopter internally had been broken, a $250 repair but it is back to original working order. They could not identify how it had been broken, might have been dropped, poor shipping handling, or any other abuse. I cannot say LP broke it, may have happened in shipping, don't know but it works fine now.