OK so the problem was a defective (maybe counterfeit?) PCM1804 IC.
Once this part was replaced (after purchasing from Mouser.Com) my receiver sprung to life:)
I am lucky I have the skills to replace this part myself.
The initial symptoms were once the QMX+ was turned on - I heard some noise that quickly faded out within a few seconds.
I figured from the beginning that I had a defective IC after hearing others with the same problems.
73's Michael N2ZDB
Michael N2ZDB