GE Dishwasher - wont drain correctly/pump works?

Hi,
My wife and i started noticing that our dishwasher wouldnt drain. I took it apart and found a few things in the bottom of a one way diaphram.
I disassembled the line from the pump back to the air gap and all the way down to the disposal and found no kinks or blockages.
I reassembled and ran again, same thing.

I searched this site and found another thread about non-draining issues and ran a rinse cycle. for the last 2 minutes there was a low sound from the bottom, that was kind of a buzzing and i saw and felt water in the line to the air gap. i believe it was moving, but i dont know how hard or fast since i DID see a few air bubbles moving inside the clear tube.

Can a pump be partially dead, i.e. not enough pressure to send the water back? i dont see any blocks in the line and dont want to start tearing it all apart.
thanks in advance. this is my first time to this site and its fantastic. i see alot of future purchases coming from here for me :0)

JON

A model number may help others help you

http://www.appliancepartspros.com/modelnumber_locator.aspx