Can someone explain what this one is exactly, when would you need to replace it? In other words, do I need it?
ProVari P3, Procyon, Radius Replacement Display / LCD - New! | eBay
That's the display screen behind the window. It's been said now and again, these displays have about a 10 year lifespan. That remains to be seen, I suppose. The caveat, if one of your screens did die ... are you or someone you know competent to tale the "P" apart, desolder the screen and solder in the new one and reassemble the "P".