In this video, I repair a dual-CPU tray I recently purchased as-is off eBay for my Mac Pro 5,1. The only issue with the tray ended up being a ripped off connector for the northbridge thermal sensor, presumably done by the previous owner when disassembling it. Although all the pads were ripped off with it, I was able to re-solder it to the ground plane, and connect the two pins back to their correct rails using some enamel-coated copper wire.