Someone can correct me if I'm wrong on this, but I'll share my experience with TMCC. I would suggest carefully removing the shell of the locomotive. TMCC locomotives receive commands from the base using the handrails on the locomotive. You need to check the wires going to the handrails. I had a TMCC GS-4 that had the same type of problem. I found that one of the wires going to one of the handrails had come off. Unlike TMCC, DCS locomotives receive commands through the track .
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