Yes, some codes may work.
You can try 30646 which may give you much of the functionalities, in my case the Channel +/- did not work but I got most of the remainder.
Otherwise, I just find out half an hour ago by reading my Onkyo AVR and Magnavox manuals that the MDR515H is an HDMI CEC compliant (or RIDH compliant) device.
That is why some specific dedicated BlurayDisc (BD) and DVD codes may also work.
These are general RIDH codes for any brands of DVD and BD players that are RIHD, and that may or may not work depending if your own device is RIHD or HDMI CEC compliant.
Here you go:
32910, 33101,33501 or 31612.
If none of these work, I am sorry, I have shared my best.
An saddly, don't expect any help from magnavox/funaiservice; I think that their recent association with amazon has turned the servoice department into diarrhea mode. Saddly, the amazon effect is the same anywhere, it appears, it kills anything it touches...
PS: You won't find any code, I believe, that will give you volume or mute control because the Magnavox Remote itself does not have a volume or mute on it.
Take care,
Denys