upper agitator will not spin. lower is fine. how do i find out what is wrong? how do i take apart the agitator? please advise
If the motor turns and it will drain then the clutch may be the problem and you need to check the brakes as well. Here is a video on the clutch,
YouTube - Washing Machine Clutch Band and Lining Repair Kit Replacement (part #285790)
and check out the STicky on direct drive brakes at the top of this page.