Whirlpool GU2400XTP Cavitation

Hi All -
I have a Whirlpool GU2400XTPB3 dishwasher that has over the years developed a problem with the pump sucking air/cavitating during the wash cycle. If I open the door during the cycle and add around 4 cups of hot water to the tub then the pump goes back to sounding ‘normal’ (quieter).

Does anyone have any suggestions? I have already tried removing the water line and checking for junk. I only got as far as removing the brass elbow on the bottom of the unit. Is there somewhere else that stuff can accumulate?

Thanks in advance.

-greg

Time the fill duration, should be greater than 40 seconds. If ok, I would replace the water fill valve, AP3178610 These valves have a fine screen that gets clogged easily.