In my experience, a defective polarizing filter will discolor the entire image, so probably no issue there. Here's a couple of things to check; first, is there a corresponding greenish line on the left side of the screen? And looking closely at the screen, does the R,G, or B element of each pixel not quite line up? If so, one of your LCDs is misaligned. You could try reseating whichever LCD corresponds the the misaligned color, but I haven't had much luck fixing this problem so I don't have much advice to offer here. I'll re-add a section to this guide to aid in disassembling this section. Second, pick the projector up and rotate it around a bit while it's running. Does the red area change at all? If so, your issue is definitely a loose mirror, which should be a much easier fix. Hope this helps!

Your issue sounds more like a mirror that has fallen off. I'd recommend disassembling through step 11, removing the cover of the mirror housing (large black "U" shaped piece) and checking if there is a loose mirror. If there is, two part epoxy can be used to glue it back in place. If you do need a new polarizer, they are compatible across most Epson models, but I don't know specifically which ones. If it looks visually similar, it should fit.

Su problema suena más como un espejo que se ha caído. Recomendaría desarmar hasta el paso 11, quitar la cubierta de la carcasa del espejo (pieza grande negra en forma de "U") y verificar si hay un espejo suelto. Si es así, se puede utilizar epoxi de dos componentes para volver a pegarlo en su lugar. Si necesita un polarizador nuevo, son compatibles con la mayoría de los modelos Epson, pero no sé específicamente cuáles. Si se ve visualmente similar, debería encajar.