Seems I am not the only one finding HOT or Dead pixels in there images. HEADS UP
I sent some raw images in to Canon and sure enough they want me to send in my Canon 5D mark III for repair. The rep told me unofficially that there has been a lot of others just noticing this issue. Advised me to wait for the light leak official repair and do it all at once
When shooting at a low shutter speed ISO Below 800 or below on a tripod longer then 20 seconds A scatter of hot pixels or dead pixels show up. I have about 8 total all in the same location some a red,green,blue bright some faint. I didn't even notice them until I started doing night time photography. I tried all the methods to re map etc no such luck.
This is unacceptable for a product that cost as much as it does. You might want to test your 5D mark III out. I told my friend who also has a 5D mark III and sure enough he also has a few less then me. The HOT pixels seem to only be visible at a low shutter speed even with a low iso range.