We have a 960 LED icicle light string, one section does not light up. I have tested the light string with a no contact voltage detector, all of the wires and bulbs in the section that doesn’t light up show live voltage. The section goes from 2 wires to 3 wires and then back to 2 wires. All the 3 wires in the faulty section show live voltage, as do all the bulbs. How can I fix this?