you and I have chatted regarding the backlight bulbs, I and not sure which bulbs are the 20 to 27 I will run test mode and see which ones I have had issues and found that it was a molex on the one of the chase boards but not sure till I know which bulbs will get back to you. and yes I am still trying to correct that back light 12 bulb issue that's tied into the robot review. chat soon,