Can you clarify "I also got code 410 to make the Play button open the tray"? There is no code 0410/1410/2410. I'm hopeful that whatever the "410" code is, it turns out to be the same IR protocol as 0782 (NEC1, device 1). If it is, then you can test various button codes, and we may even have some suggestions.

Magnavox is a famous name, and it is in fact a "brand"-- they don't actually make anything. So there are tons of different IR protocols used by Magnavox equipment.