Do-It-Yourself Story

To ensure problem fixed, I replaced the entire motor-sump pump assembly which can be done as a single large unit replacement. I think it likely noise was pump but figured better safe than sorry AND then at least I knew virtually every major moving part was new again. You might find other small 'hiccup' in repair, like this dishwasher had original solid copper water supply line from time house built so I elected to replace it with a more modern flexible stainless steel braided hose, added less than twenty bucks but eases re-install under cabinet. Overall easy fix, BUT, it was VERY difficult to get the very large rubber gasket around unit to install, even lubricating it first as instructed, and fell out repeatedly before clips can be applied.. In repair video the guy just drops it in and 'seats' it.