How to Troubleshoot & Replace Whirlpool AP6012223 / WP8268316 Dishwasher Lower Spray Arm Support Hub

I initially just removed the spray arm and top cover of pump assembly inside the bottom of the washer. Removed match sticks, broken glass bits, a small metal ball, broken plastic fork. Thought problem would be solved, but no,and was disappointed the sound remained after reassembly and a test wash cycle. That basically left the circulation pump. I decided to order the pump and motor assembly together because it was cheaper than the pump alone --and-- there was a chance of other debris in the impeller inside the pump housing. Got part in less than 2 days. Watched the install video to get pointers and proceeded to remove the old assembly and install the new one. It was not hard at all - tricky part was to seat the assembly in the washer bottom - making sure the rubber seal was seated all the way down. Not hard - but you need to be persistent. I took my time. Reconnected all plumbing and electrical connections and tried a test wash cycle.Perfect ---- and quiet. I figured I saved 150 - 200 dollars over calling for a repair and scored a few points with my wife.Have confidence in yourself and go for it! 

Replaced food grinder and heating element. Screen in food grinder was more than 50% blocked due to broken grinder. Heating element was not working after something had fallen and melted onto it, breaking ceramic coating. Videos were very helpful.