Lionel 4-6-2 Pacific "NEW HAVEN" cab number 1334 now works in TMCC command mode. I built a replacement backplane for 691-PCB1-05F using the wirelist I generated from the original backplane. All functions work as intended. I used the original R2LC board and the 103E-unit that came with the locomotive.The replacement backplane is not fancy, just perf board and square pin strips . Many thanks to the person who created the diagram showing the pinout and signal names for the R2LC radio board I found on the O gauge forum.
Jim