First, quickest, easiest and cheapest (free) step is to check that the screws are tight on the pump housing. Remove lower spray arm assy and check the screws around the perimeter of the pump housing.

If housing is loose, water will spray toward the splash deflector at the front of the machine, causing water to flood over the edge of the tub. This happened to me. I was checking gaskets, taking apart the door, etc. A tip on a fixi site directed me to the pump housing. When I saw it it was clear that the screws were loose. I removed them, reset the gasket, replaced the screws -- leaking stopped immediately!