Set washer to 10 minute wash. Washer fills, agitates aporx. 2 to 3 minutes; then it starts spinning & spraying more water. Water over fills tub & leaks out over the top of tub. Water is not soapy. Pulled off the front washer panel to watch the tub & see what machine does. When I stopped it & put it on spin, water drained. It works fine on the rinse cycle. The wash cycle is the only problem. Thinking it's the wash timer. If this needs replaced, how hard is this to do, and will I need a diagram?