Whirlpool Quiet Partner I - Gravel Sound

Hi - I recently had new floors and counters installed and had to remove the dishwasher to do it. Prior to uninstalling the dishwasher, we had no issues with it.

When I re-installed everything and turned it on, we now get a gravel sound when after the water fills up the dishwasher and the wash cycle commences. Its not a very loud sound, but it is present and just sounds like some small pieces of gravel (I’m sure it’s not gravel, but that’s what it sounds like) are circulating in the wash.

I read-up that the sound could be some food or other object in the food chopper. I removed that and cleaned out that section (there was olive pits and an earing) but when I reassembled everything it still made the "gravel" type sound.

It sounds like it is coming from below where the chopper is housed (where the drain hose is connected to, but I don’t know how to get at that).

Any ideas? I have a video the sound here - https://www.dropbox.com/s/ph5ncu088k83eez/IMG_3145.MOV?dl=0