The tube to the pressure switch is clogged. I ran through all the steps you listed too, to no avail until the pressure switch vacuume tube was unclogged.

Good luck!

I too have a 7 year old Whirlpool Duet washer that had problems draining. I went through the processes of cleaning the pump screen which was loaded with junk. Shortly after that, the same problem resurfaced, so I replaced the pump. A week later the problem started again. I sat down, looked in among the pumps and motors, and wondered if the rubber boot that goes from the tub to the pump might be blocked. I removed the boot, which was a task because the hose clamp was at the back of the washer, and when I dropped the boot, hanging there was almost 2 handfuls of lint, fabric, and whatever else that couldn't get past the backflow ball in the boot. By simply reaching up, I removed all of this debris from the washer tub. While the boot is removed, you can actually see through the drum by gently moving it from side to side. You will see the heating element and will be able to see if all of the debris was removed. To remove the large clamp from the boot to the tub, I used a hook to grasp it and pull it to the front so I could squeeze it to get it off. Getting it back on was a task also. I squeezed it together on the floor and put a plastic cable tie on it to keep it open. After getting it back on the boot, I cut the cable tie and made some final adjustments with a pair of pliers. Since doing this, there has been no problem with the washer draining. I assume that when the pump filter screen became blocked, lint and other things began to accumulate in the tub drain, and eventually built up enough to cause the seemingly irrepairable problem. Hope this helps!!

After replacing the pump it still wouldn't drain. Thought about it for a couple of days, verified that the pump was working as it should and thought that it might not be getting any water.

Took off the piece coming from the bottom of the tub (where there is a ball float valve) and it was completely clogged with a HUGE hairball.

Wash, rinse, repeat -- works like brand new now.

I too replaced the drain pump, did the pressure switch test, cleaned out the filter and all the hoses. The culprit was the pressure switch hose!! I didn't even see that. Such a simple fix and no where on the web but here. THANK YOU!!!!

Sorry for resurrecting a long dead thread, but where is the pressure switch hose?? I can't see any other hoses besides the tank drain and the pump drain.