Audio disappeared from PP

I completed recording audio to my presentation, I edited the audio for a couple of slides, then saved it, and went on to sync the animations for the slides I recorded.  I was unable to hear the audio. 

I attempted to publish a few slides to test it out....... still could not hear the audio.  I checked the speaker settings, because I was hearing the audio during playback when recording.  All was good.

I decided to save the presentation and close it, then reopen.  I did so, and then tried to publish the presentation so as to check to see if I could hear the audio.  The presentation published, and the audio was playing and the animations were appearing on the screen, but I could not hear audio.

I again closed the presentation and reopened.  Now, the audio is completely gone.

Help?

*I still have the published file saved.  is there any way to extract the narration from that published presentation and add it to a new powerpoint?