NOTE: We realized we omitted a key detail in this episode. When the guest discusses the remedy of shining a phone flashlight against the radio panel to make the display brighter, she is most likely referring to the panel having a faulty light sensor. Some avionics have an auto-dimming feature that uses a light sensor, which adjusts the brightness of the display to coincide with the ambient light level.
We apologize for any confusion this may have caused.