<<<The machine is working fine, but now I am getting a whistling sound when I used to get that snoring sound.>>>
The SUMP ASSY that you received was built during 2010 or 2011.
During this manufacturing period---a different CHOPPER was used (rather than continuing to use the original).
The reason for the re-designed CHOPPER remains a mystery (for me anyway).
The CHOPPER that is in your Sump Assy is part number (5832DD4001A
)---and has sharp points/tips on the ends (like an indian arrowhead). This pointed edge---is the cause of the whistling/rumbling noise.
This has been replaced with the new part number (5832DD4001B
If you still have the original Sump Assy---that one can be used as well.
Remove the upper and lower rack assys.
Lift off (unsnap) the lower wash arm.
Remove the water tower (upper wash arm) from the rear/center of the dishwasher.
Remove all of the Phillips screws from the Sump Filter Cover---and lift off the filter.
Pull off the round white-color "valve" (make sure that the o-ring in still in place).
Remove the phillips screw from the center impeller (this is a *reverse-thread* screw) and pull off the impeller.
Lift the gray plastic chamber from the center of the Sump---and you'll see the stainless steel CHOPPER---replace it.
Re-install the Sump Assy components.
Test dishwasher while inspecting/checking for leaks.