Whirlpool Service Pointer - Ice build up on bottom of freezer. Defrost water does not drain. Duck bill check valve plugged Amana Jenn-Air KitchenAid Maytag and Whirlpool Refrigerators Models 5GBB19PRYA0 5GBB19PRYW0 5GFC20PRAA00 5GFC20PRAW00 5GFF25PRYA0 5GFF25PRYW0 5GI6FARAF000 5GI6FARAF001 5GX0FHTXAF01 5KBFS20EAX01 5KRFX9000M00 5MFI267AA000 5MFI267AA001 5MFX257AA000 5MFX257AA001 5VGI6FARAF00 5VGI6FARAF01 5VMFI267AA00 5VMFI267AA01 5VMFX257AA00 5VMFX257AA01 7MI2569VEM1 7MI2569VEM2 7MI2569VEM3 7M