That’s great that it’s working now!
Are you saying that TP3 has 12v on it? If so, it appears the LED has been damaged…probably by the spark. It needs to be replaced. You might also want to check TP2. Also check to see if there is any AC voltage on TP2. It’s good to make sure other components weren’t damaged as well.
Here’s a method that makes it easier to replace the LED with out removing the board… Clip the old LED off at the board and mount the new LED in the chassis socket and run jumper wires down to the pads on the board. To do this, cut the new LED’s leads fairly short and bend little hooks in them. Bend hooks in the jumper wires too. Hook the two hooks together (the LED lead hook and the wire hook) and bend them together with your pliers and then solder over the connection. You can use some hot glue or something to affix the LED to the chassis if it needs it.
Let me know if you have any questions.
Good luck.
-Brach