Should I maybe ditch this mosaic dataset and make a new one from scratch instead of trying to repair/update it? What pyramid and overview settings might you suggest if not the defaults? Nearest Neighbor? This is a one band, (black and white with no grey),1 bit pixel depth scan of a base map of water utility assets. It will be displayed instead of aerial imagery or street/parcel views with our lines and points displayed on top when more detail about original conditionals is needed. In fact, the overviews are pretty useless - all I really need is the zoomed in detail.