I called Borgeson and they thought that it was the pump because it stopped working completely. In their opinion, if it was the steering box it would be more likely that it fail in one direction, not both. I took the pump off and went back to the repair shop that rebuilt the pump a year ago. They took it apart and found the relief valve had failed open. They charged me another $100 (no warranty, only 6 months). It works good now. The concern that I have now is that both Borgeson and the repair shop suggested replacing the factory pump with a saginaw pump. Borgeson said they have had problems with the factory pumps providing enough pressure.
Hope this helps someone in the future.