Romona S Cicero , NY September 19, 2021 Appliance: LG Refrigerator LFX28978SB Lg Refrigerator Lfx28978sb / 02: The spring on the flapper broke. How to replace Flapper Door Spring. Remove the flapper from the main door. Put in a new spring and put the flapper back on the main door. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes