Well since nobody else is stepping up...
It's rare that two of anything break exactly the same way at the same time. So if both projectors are hooked up to one FB3 look there first. Look for a single point failure. For example if you've got some sort of buffered ilda splitter perhaps one of it's power supplies blew. An offset circuit with a pot that expects to see +/- 12 volts that just sees one or the other is going to offset hard toward the rail that's present.
"There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso