comment: >
  
  You're right, guess I was a little tired when writing that.
  But the fix should still work as long as the other switch is on the same row/column (which one depends on the board, trying it out won't hurt).
context: First:  google the m3tt3o “anatomy of a keyboard” article, specifically about how rows and columns work. 
  Second, use a pair of tweezers to figure out which column your switch is on.
  Third, google up a YouTube video on “switch bridge” and bridge with wire and solder to the appropriate spot. >
  
  This. It should work. Wish I found this before. I figured this out the long way for weeks out of desperation tweezering my board with lifted pads.
  I was able to use other rows' solder point and got all keys about 5 of them working (yes i managed to bork about 5 pads), but i must say they are all through trial and error. >
  
  It's not going to a diode, so it was probably the ground pad. Try and see if the PCB registers a keypress when you bridge the other pin of this switch to the ground pin of another switch. If it does, you can just solder the switch on one side and run a wire to another ground, then it'll work. >
  
  Since there are diodes on the PCB, I assume it uses a key matrix (like most keyboards do), it shouldn’t be connected to ground