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If you want to try re-seating the display ribbon cable, the tear down instructions are in the NAV-TV manual, available online. It's about as hard as working on a laptop computer, but not impossible with regular electronics tools.
I am having the same issue as of Friday my screen for the pcm and the touchscreen buttons do not work unless you press the location where they would be if the screen isn’t inverted. I already rebooted the pcm using info and option buttons but it’s still inverted.
Update - took it to the dealership; they told me it the PCM has to be replaced (this was not a surprise) however Porsche doesn't make the unit anymore so there is nothing to be done. Quick note they still needed the diagnostic fee to tell me this... Anyway Becker is the only option they say they charge 950 to 1050 depending on the PCM version to fix.