Whirlpool washing machine does not spin to drain. Otherwise, the motor IS running, the agitator IS moving, the water IS draining. If I open the lid & I notice it\'s not spinning to drain, I reach in and turn the tub about 1/4 turn clockwise by hand. Then, once I close the lid, it spins to drain. I have tried Master Reset, replaced the lid switch, and the checked the hose for water level control valve (blew air into small plastic tube). I took a quick look at the coupling (did NOT take it apart) it did not look broken, cracked, etc. Thoughts?