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Boards like this are typically made in a device kind of like a pizza oven. The solder pads are screen printed with solder paste, the chips are placed by machine and the whole unit goes through the oven. You can remove a BGA chip with a heat gun. I would only do it on a board that you don't want anymore. But for the purpose of getting the info you need that is the best option.
The motherboard is undoubtedly multilayer so there is no guarantee that there will be visible traces from the contact you are interested in. It might be possible to find a connection to the contact, but it will be difficult. If you have a circuit tracer it would help. Good Luck
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