After seeing the repair video about replacing the spring and hinge cable, I checked, and my problem was that both hinge cables were broken. I then ordered two springs and a pair of hinge cables from appliancepartpros.com (since it was their video that convinced me how easy it would be to do. When the parts arrived later that week, I did the repair (took about 10 minutes) and now the door is better than it has been in over a year (looking back, I clearly had one broken for a long time before the other one broke--in the future, I'll do this repair earlier).