OK, I took it apart. The green wire off the connector is broken. Broken where the wire penetrates the boxcar base. Microsurgery to fix. Seems like there are 2 red wires and one green wire in the LED string. The green wire must be common to two parallel red paths in the string hence no illuminated LED's on string. Guessing it was an assembly error that resulted in the broken wire. OBTW, it's the green enameled wire that's broken.
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