LG Refrigerator: Door beeping every 30 seconds when closed

[@Neilikins]

LG GR-P157NIS - Side by Side Refrigerator with Indoor Ice Maker **Buzzer Sound Mute mode** Will set the buzzer/beep/error/ding/alarm sound to "off" ​ Press and hold the "Express FRZ" button for more than 5 seconds (you will hear a beep, the final beep!), and Mute mode is active until the next reset. You can unmute with another 5 second press on the "Express FRZ" button. ​Perhaps your model has the same or similar. I found this info in the Service manual and not in the user manual.