Your DC jack is correct RED to pcb 9v, black to ground and pink to battery +
With your jack you can see where the tip connects to so you can simply follow that around to it’s solder lug
or you can continuity check which lug connects to which part the longer being the tip and the shorter one the ring for battery ground
If you have lost bypass then it must have been wired correctly initially
Make sure the solder lugs connect as shown in this picture or as I say follow them round from the tip to it’s solder lug
As Barry says carefully try and remove some of the solder, ball like joints may be dry inside simply heat up with your iron for around 4 seconds and remove some, be extra careful with your 3PDT switch lugs too much heat can damage the switch internally if you have a solder sucker great use that if not you’ll have to use your iron to remove it, try reflowing the blue wires on your 3PDT first once you get bypass back of course!