Thanks blued888. The only problem is you will not readily know what PCM signal the AV receiver is receiving since it just indicates PCM in the display.
ricochet315, you can use your PS3 remote to display the audio info on your tv screen. That will be the current signal receiving by your AV receiver.
If you really want to see the TrueHD or DTS-MA light up in your AVR display then you will have to get a BD player that is capable of outputting HD bitstream as explained by blued888.