Growling noise

Growling noise at different times throuout cycle. It is getting louder and louder . Never did it before . Wondering what I might l look for:mad:

Remove the lower spray arm, the filter guard (#4 on the diagram) and the discharge (#5). Check for a foreign objects inside.

Here are the break down diagrams and Replacement parts for MAYTAG MDBTT79AWW | AppliancePartsPros.com

Gene.