Dishwasher has been in use for about 6 months since it was installed brand-new. Several days ago the wash performance noticeably decreased, and every load now finishes with numerous dishes that are still dirty. I've cleaned the filters, have run a cycle with an extra quart or two of water dumped in the bottom, but neither action seems to have affected the issue. What's curious is that the location of the still-dirty dishes seems to jump around from load to load. One load it will be the bottom rack, next load top main rack and very top silverware rack, next load bottom rack and very top silverware rack, and so on; it's not very consistent from load to load. Have run cycles on both Auto and Express modes, with no difference noted. We've always used those same two cycles, though, so I don't believe it's related to the selected mode. Going to try the next load on Normal just to see, though. Anyway, looking for any additional troubleshooting ideas and/or any Service Manual/Diagnostic Mode Instructions/Troubleshooting Guide that someone might have for Cafe dishwashers.