Thanks. I have taken the inside door tailgate cover off, removed the thumbsize camera and set it up again, all to no avail. Begged another dealer, not the sell site, to reset it and establish the parking lines, but that didn't work for video. Parking lines disappeared again one day later. Multiple complaints out there on the same topic for many models of Fords/Lincolns in recent years. Very weak response from Ford that this is a device that can 'wear out'. The vaunted 'service' of Lincoln Canada fell way short when I took it to their head office. Nice people there, but no one could say 'yes' to resolve this problem.