Quoted from KenLayton:If the component supply to repair pinball boards becomes a major problem, then it might be a better option to design a new replacement board.
True that.
Some system 11 display driver chips were already in the +20 range (each) but buying a replacement LED display is the way to go if you need the unobtanium driver chips or display glass.
New driver and sound boards will be needed at some point for repair or replacement if components are not available.