I came across this issue like so many others and I was able to solve it. Perhaps this will be beneficial to others. I ran many self cleans but it did not work. Also ran a couple of bleach cycles, then some vinegar cycles. The brown flakes still appeared but the unit seemed cleaner and there was less residue. Finally I took off the pulsator, cleaned underneath and also cleaned the pulsator. I realized most of the residue was coming from inside the pulsator, which I was unable to clean out. In an effort to switch out the pulsator, I ordered the new part that corresponded with my unit's model number (it's called an assy pulsator) from an online appliance part store for about $100. I installed the new pulsator and I no longer have this residue in the wash cycle.
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