Thanks to everyone for your insight and advice.
I have three other Legacy steam engines -
NYC heavy Mikado
UP H7
SP Cab forward
All of these engines had the sound dropping out issue when crossing switches, and they had the 9v battery connector in the tender. Installing the 9v battery solved the problem.
I knew the new NYC Hudson would not have the Legacy Memory Module. I guess we now have to install the sensor track in our GarGraves layouts or it's time to pull out that Legacy manual and enter the engine info the hard way. I had no idea that the battery back up connection would also be eliminated in a $1,300+engine. Pretty dismaying.
Enough belly aching, back to a solution. If I purchase the #691-1415-129 9v battery connector and install a battery will this fix the problem as it did in earlier legacy steam engines? Is there room in the tender for the battery? The 5413 has a PT tender, I wonder if the smoke unit for the simulated water scoop affect will leave room for a battery?
Could somebody take a picture the port in board in order to help us who do not have a lot experience tinkering with circuit boards, assuming the port still exists on the board?
Thanks again to all for your help.
Richard