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Is it possible to replace broken power an eject buttons on PS4 Pro?

Hi, It should be possible. Here is a link to the ifixit PlayStation 4 Pro Repair guide. It shows how to dis-assemble it, You should then have access to the buttons. Here is a link to a supplier of the power button. Here is a link to a supplier of the eject button It is not a recommendation to use the suppliers. It is shown to give an idea of the cost of the part. You may find other suppliers online that suit you better. Hopefully this is of some help