I have a Lionel Postwar Celebration Virginian FM Trainmaster. It has TMCC and Railsounds. I picked this up about 6 weeks ago. Everything was working find, then exactly 31 days after purchase (30 day return policy), the sounds stopped working completely. All of the TMCC functions work correctly, but no RS. I do get what sounds like a low level "pulsing" sound out of the speaker, but that's it. I did check the resistance on the speaker, and I got a reading (about 16 ohms, I think). I pulled and replaced all three boards (sound, control and power boards), and reseated most of the connectors. I even pulled out the sound module from the unit and put it in another TMCC/RS locomotive I have, and the sound worked. I then tried that unit's sound board in the Trainmaster, and same result as with the original board. So, it does not seem to be a bad sound board. Any other tests I can do to narrow this down? Any idea what may be at fault?