How to DIY it: A simple cleaning often solves the problem. Start by pulling out the lower dish rack. Remove the spray arm and use a thin piece of wire to clean out the holes where water sprays through. Scoop or vacuum out any leftover food particles from the filter area, then remove the filter screen (above), if possible, and give it a good rinse.
How to DIY it: This job can be messy, so protect nearby surfaces by covering them with plastic or cardboard. Spray the springs with garage door lubricant (about $7 at home centers). Don’t use oil, grease, or other lubricants. They may be cheaper, or you may have them on hand already, but they won’t work as well and tend to pick up dust and grit—just what you don’t want on moving parts.