The radio has worked intermittently since I first started driving this car. Today it stopped and didn’t come back, so it’s time to figure it out!
Turns out it is a problem with the ribbon wire that connects the left from the right side of the dash. Unfortunately this is part of the main dash harness which is no longer available even if you wanted to spend the money. I ended up adding an extra wire to make the connection again and bypass the ribbon cable.