My Kenmore trash compactor door won't open smoothly any longer, It gets stuck about halfway in, and i have to lift upward and push back to close it. Before, i could just push it shut and it would easily roll shut. I'm not sure what changed things. I don't recall any mishaps. I've taken the trash drawer/basket out and inspected all the moving parts, but can't seem to locate anything that's nonfunctional.