Deb, I'm hoping you're not totally confused by the motor coupler thing...I'm sure he meant well, but it's likely a bad lid switch; here's an excerpt from a similar situation:
"Customers machine would agitate but would stop when it got to the drain and spin cycle, leaving a tub full of water. I opened the top console to expose the wiring harness to the lid switch.
(Note: Some machines will not agitate if the lid switch fails)I disconnected the small lid switch harness connector and used my OHM meter to check the 2 outer terminals of the exposed plug which goes down to the switch.
With my OHM meter set to the lowest scale, I found ZERO continuity (no reading) thru the lid switch contacts, proving that it was bad.
I removed the cabinet
and installed the new lid switch in about 15 minutes."