Did the ink actually run or is it mostly smeared? If the pages are still readable you might be able to dry it slow between paper towels and save some of it. What kind of pen were you using, was it a gel or a ballpoint?

The "preheat beep that never comes" part got me because that is exactly how half the stuff we own works now. Nobody reads the manual, everybody just assumes every machine works like the last one they had, and then they blame the machine or themselves when it doesn't. My coffee maker runs a whole clean cycle if you hold the button down too long and my dad swears it is broken every single visit. My car tells me to check the tire pressure when it just means the sensor is cold. We have all these little devices screaming instructions at us in beeps and lights and we just ignore them and guess. The air fryer thing is the same deal, people treat "preheat" like a rule of nature instead of something you check per model.