Lionel Legacy Zephyr 6-38864.
I finally was able to assess in a nutshell what is happening.
All functions work on this Diesel engine. However, the sounds will cut out randomly or come on and cut out if the horn is applied.
Now...if I reduce the VOLUME either at the volume pot on top of the engine or on the Legacy remote by one third........then I can get all sounds to work without cutting out.
Is something failing on one of the boards? Not sure where to go next on this issue.
Thanks again Guys for any assistance.