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I thought so too, and I swapped the toner concentration sensors between the yellow and the blue, but to no avail. I can't even get the damn problem to move, let alone to stop. I'm convinced that it's a charging problem and that I just don't have a high enough voltage on the yellow charging station, but it's not the HVPS or the HVSP transformer, because both perform just fine when moved to another color. It must be dropping voltage somewhere else, but I don't know where that could be.
If you can get into PSP, we can look at your voltages and verify the values.