GE Dishwasher Won't Drain

I have a GE Dishwasher Model GLD5600. The dishwasher is 3 years old, and up until now, I have never had any problems with it. This week, it decided it no longer wants to drain. I read the owners manual, and the only suggestion was to run the garbage disposal to clear it of any debris. I did this, but the disposal was already empty, so this did not help. I also removed the sprayer arm (?) to see if anything was clogged under there. I was afraid to try to remove anything else and risk breaking a part that was fine to begin with. Any other suggestions for what I can do to find out what’s causing the problem?

Okay I reposted in the proper section. Thanks!