The red arrow shows here the location of the electrical short, which is where the top bunch of LED's are soldered (two wires) onto the LED string on the spirals.

There are four such locations which need to be carefully inspected preferably with a hand lens.

What you are looking for is some slight discolouration around the solder joint or the transparent shrink-fit transparent insulation over it. In my case it was very subtle. Also look for spiky solder which is trying to punch through the transparent shrink-fit insulation.

If you find a suspect area, tease the two wires apart and hopefully the LED lights will come on when plugged in.

Use glue or hot wax or some other method to hold the two wires apart.