URC's Complete Control Program has 16 IR code sets for Epson projectors. Out of those 16, only 3 of the code sets have discrete power. (579, 767, and 769). With 769 actual just having a discrete off and a toggle power to bring it back on.

So you tried all 3 of those code sets? And none of the discrete power commands worked the projector?

Seems sus!


[edit]: By the way, did they lose the factory remote? Because the factory remote has the discrete off code on it. You learn that into the MX900 and you have your anchor point for powering the projector on & off discretely.