I separately bought a new Bachmann Spectrum Sound Ready DCC-Equipped On30 14-Ton Heisler (Item 28804) and a new Bachmann Spectrum Plug-and-Play Sound Module for Bachmann On30 14-Ton Heisler (Item 44953). I installed the sound module according to the instructions – all CV defaults were unchanged from the (presumably) factory defaults. The locomotive was run a few times (so beautifully slow as to be almost not seen as moving! and faster) but it was not changed from the factory assigned locomotive number. The sound module is firmly seated, and all 21 pins are visible coming up through the board, so no pins are bent or not connected. The reinstalled rear light functions as it did before installing the sound module. Unfortunately, there is no sound whatsoever from the locomotive/sound module. Does anyone have any thoughts as to why there is no sound and/or any suggestions on what to try to diagnose and fix this problem? Thanks.