Can I replace audio in blu-ray movie?

[Guardian2099]

Is it possible and if so, what programs do I need to accomplish this? Keep in mind this isn't a blank disc but a store bought disc. I want to change the default audio to a different sound track. In my blu-ray disc contains only two audio options.

English DTS-HD Master Audio 5.1 and French DTS Mono. I'm trying to insert an English DTS mono track into the disc. Most likely I'll have to re-author the disc yes? I used anydvdhd to lower the restrictions.

I'm still just a novice but I really would like to know how this can be done. Details step by step would be helpful thanks.

[aedipuss]

if it doesn't have to stay on a br disc then i'd convert it to mkv and then use mkvmergegui to add the audio and move it to the #1 position.