Things I tried: 1. Trap clean out 2. Cleaned all drain tubes 3. Snaked the drain line 4. Drain pump bench test 5 2' Black hose clear 6. Reservoir with single screw. That's the one. The reservoir was clogged. Thanks to the previous post. Moral of the story: 1. We're switching to HE soap. (Duh) 2. Use a very bright light to see if tubes are clogged.