This is a Whirlpool built in oven. When the start button is pushed to begin baking or broiling a loud rumbling/rattling niose comes from the control panel area. The oven works fine so far.
Here are your parts
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=RBS305PDB16
Here is a tech sheet
https://www.servicematters.com/docs/wiring/Tech%20Sheet%20-%208301758.pdf
Sounds like you may have a blower problem Item 3 in "Top venting parts" section