The dishwasher has become very noisy at times, making two different pitched sounds. One sound is a growliing-like sound and the other sounds like pump cavitation. I'm a mech engineer and familiar with pump cavitation sounds. The tub pumps completely dry, but the discharge flow into the drain at the garbage disposal seems to be low, certainly lower than what it was when installed new. I was thinking it might be a partially blocked pump suction. Is there a source where I can get an assembly manual for this dishwasher? The dishwasher has been in use about 2 years.
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