You may have somethng jammed under the agitator, but more likely something jammed in the transmission or the coupling came apart and is jamming the machine.

See if the coupling is ok, and see if you can use it to turn the transmission. Pull out the transmission and check it for leaks.

Well, the motors on these models almost never fail, and your symptons now indicate a problem with the capacitor, but it almost never fails also.

A few days ago someone posted with the same symptoms and it turned out the capacitor had become disconnected from the motor, which also almost never happens. So I would

1. Check the motor connections and the connections with the capacitor.

2. If they check out, try changing out the capacitor.

3. If it checks out, then maybe it is the motor.

As Sherlock Holmes said, when you have eliminated the impossible, whatever is left, however improbably must the be the trust, although to be fair he never repaired a washer.

Good luck, let us know how it turns out.