Cielo, ignore my pm, i didn't read this till after i sent it.
Don't bother trying to short the switch since the jack is 99% still fine. Instead just make sure that all of the connections are strong. Heating up each solder point should...
Probably no-longer helpful to people in this thread but for anyone googling this issue in the future.
I was able to find a full ciruit diagram for the 9300 mainboard (The DAQ la-2171) on a vietnamese forum (vinafix.co.cc) with the file...