The sensor bar seems to be okay
They asked me to look through the view-finder on my digital camera, to see if the sensor bar was working correctly. I didn't know you could do that. What they're looking for is five red lights on either side, my eyesight isn't good enough to make them out, so I took a picture, and sho' nuf, there they are!
I love technology, even (sometimes) when things aren't working correctly.
I bet my unit is okay, I just must be pressing the wrong buttons.