Dishwasher drain problem

I've had this Whirlpool 1200 dishwasher for about 6 yrs now.
Every couple years it eats an impeller/chopper and I've gotten pretty good at tearing it down & replacing the thing.
A couple months ago it started a new problem. Every once in a while there would be [pretty clean] water standing in the dishwasher at the end of the cycle. [i leave them in over night- it was there in the morning]
Nothing was leaking so I figured it must be the drain pump- as the overflow was working somehow. So I got a new pump and all was well for a while.
Next time there was water standing in it I tried blowing back through the hose where the drain goes into the disposal. Bubbles came up in the dishwasher- and it drained when I hit the cancel button.
A couple weeks later it clogged again. This time I thought I'd try to suck the clog through the pipes. Hooked shop vac to drain at disposal- tried to suck for a couple minutes. It wouldn't budge. But I could still blow into that pipe with just a couple pounds pressure and clear the clog.
Now it is leaking out a little bit during the cycle. Sometimes it seems to clear itself- as I'll have a puddle, but the drain will be working by the end of the cycle.
Through all this it seems to be washing the dishes well- glasses and silverware are rarely spotted.
Any thoughts on where to look?
Thanks, Jim
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Seems it was 2 problems. The intermittent clog was a little rubber flapper of a check valve that had come apart-
http://www.appliancepartspros.com/partsearch/model.aspx?model_idP3862 part number 5 on the pump and motor parts diagram [Part Number: AP3152971 ]
I tore things down to where I could see the inlets to both pumps and ran 3 cycles before it clogged again. Then I blew like hell on the drain hose back towards the dishwasher, and the little rubber disk appeared.
The leak seems to be a bad door seal. Parts about $20 apiece.
I'll know for sure next week- but I think life is good.
Jim
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