Can you get into the system setup menu and just disable the password protection? I have an Ultra and that was the first thing I did with it, otherwise you have to enter that code every time you want to blind scan a satellite. BTW thats the same code my manual gives for my rec, sorry I don't know of any others. Might try google for more possibile codes to try..
Or if you can get to it, do the factory default and try starting over.