I get your logic Brach, it makes perfect sense, but I think you missed the part where I said there is no voltage on EITHER SIDE of switch. So, the power is not getting from the power jack (or battery… I tried with both) to the switch. I can see 9V at the actual terminals of the jack (so I don’t think the jack itself is bad), but it could still be shorted where it meets the board (sloppy solder, stray wire, who knows).
So, unless you can think of something else (I’m certainly open to other ideas), I’m assuming the jack needs to be removed, cleaned off, and re-soldered. I was going to try that today. The reason I wanted a replacement part is because I think that jack is going to be difficult to remove from the board and I may damage it in the process.