@mrfixit50969 this could very well be the button board. Time to take it apart by using this guide [guide|60904|Sony SRS-X55 Button Circuit Board Replacement - iFixit Repair Guide|new_window=true] Next you want to clean that with some high-grade (90%+) isopropyl alcohol and a soft brush. Check the board for any damaged components. It might be helpful to post some front and back pictures of the board to see if we can find anything "odd". Use this guide [guide|21499|Adding images to an existing question - iFixit Repair Guide|new_window=true] for that.
Which part could be the faulty one which needs to be replaced more likely? Unless ruled out, my prime suspect is the button board.