I have a Xerox Phaser 7400 which has a problem with occassionally printing lightly. I don't think that is the imaging units since they have been replaced already. The weird thing is that it doesn't happen all the time. It's not just one color either. You can print a page and the whole page will be very light. The next time you print everything will be perfect. It seems more like a logic board issue than anything else. I am just not sure which way to travel with this issue since there is no documentation to suggest which way to go. Any suggestions will be greatly appreciated.