About a year ago I was able to repair dishwasher drainage pump without needing any parts. This was due to the great videos and indexing at the AppliancePartsPros website. Disassembly and reassembly were easy to follow from the video.
I was almost glad that two wheels fell off dishwasher rack and the dog chewed, so I could make a purchase and reward well above average website.
Wheels just snapped in so didn't need a video for that.
Also 6 months ago used video to help diagnose dishwasher issue for my son-in-law.