Mark G Toms River , NJ May 21, 2023 Appliance: LG Refrigerator LFX31925ST Lg Refrigerator Lfx31925st: Broken door flapper. ( French Door Mullion ). How to replace French Door Mullion. A couple of screws and a connector. Easy peasy. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes