After Discussing this issue at length with both Dynamax and our dealer/service center, this is not an issue with only our unit. They sold another 2015 Force with the same issue, and the fix is to replace the trailer incandescent lights with LED units and all works well. Seems odd, but if that will put this ONE issue to bed than we shall do the conversion.
Would still like to see the schematic from Dynamax for the exterior coach lighting, but seems that will not happen.
One down plenty more to go.