The jumper wires should have been properly solidified on the logic board to avoid this kind of problem. Even a minor drop could break the fragile solder joints.
If you want to do this yourself, my only recommendation would be to not underestimate the challenge. The scales involved are truly minuscule. Practice on some other boards if you can first to see if your tools and skills are ready for the task at hand.
If you have the schematics, then you have everything you need. Figure out what the connector connects to and then look at the board-view to see where that is. You will need very small gauge wire. I use 36 or 42AWG. The old wire wrap wire (30 AWG) is usually too big.