The washer won't agitate nor spin but it does drain. About 2 weeks ago, I changed the coupler and the machine worked fine. Last week, maybe due to an overload of laundry in the washer, the washer stopped agitating and spinning. So I ordered a new coupler. I changed the motor coupler and it still does not agitate or spin. The motor just makes a humming noise. Prior to changing the coupler , the motor made more of a clanking or grinding noise. So whats next?