Well, today I removed the boiler shell so I could inspect the wiring to the motor and field. While I had things disassembled I removed and cleaned the armature and everything inside. The wiring looked pristine and was correct. After reassembling I did find I had reversed 2 wires from the reverse unit to the 4-pin plug but it made no difference. The loco still runs backward fine but will not run in the other direction. Perhaps I need to replace the finger units with new ones? The mystery remains.
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