ray_afraid said:
^Yeah, it was shown at a comic-con or a starwars convention of some kind. And I think you're right about it being in color, but there were color photos of that scene in the ROTJ storybook, so maybe my brain is coloring the footage with my childhood memories...
The convention footage seems to have been taken down, too (at least I can't find it...)
I remember the Topps card showing Luke hanging from the grate, and wondered why it wasn't in the movie!?