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There is only 1 MCU lead that is the B button, and it's marked with red as well in the pic.
But....The xbox one controller sticks are cheap and have a bad offset that is calibrated and saved upon initial start-up. swapping the sticks has about a 99% fail rate due to this offset. RDC has made a chip to fix this offset, but I am not sure if he has went into full production. his fix requires cutting traces and soldering to small vias and traces. (not for the faint of heart)
Soldering to both spots at D14 would cause the B button to be pressed all of the time. Ripping up the top pad of D14 is the problem now, as that has opened the B button trace, so soldering the new Tact to the B button contact would do nothing. You need to solder a jumper wire form the left side of the B button contact, provided that it's not already ruined, to the first B button via now. If you ruin the Via on the top then you have 2 more on the top to attempt to get that right, if you ruin all of those then you'll have to connect it to the one on the bottom, if you ruin that you'll have to connect it to the lead on the MCU, if you ruin that then you're done. The entire B button line is traced out in the pics on the first page.